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Hello,
Recently purchased a Note 8 SM-N950F from a fellow who said he purchased the phone while in India. Initially, it was reading my Telus Sim, but no Data, after a factory reset, the internet is now working. Curious if there is anything I should do with the phone, should I flash it with anything through ODIN for it to operate better on the Telus network, or do I leave everything as is?
The benefit of the N950F is that you can flash custom ROMs on it correct?
Thanks
Hamsnacks said:
Hello,
Recently purchased a Note 8 SM-N950F from a fellow who said he purchased the phone while in India. Initially, it was reading my Telus Sim, but no Data, after a factory reset, the internet is now working. Curious if there is anything I should do with the phone, should I flash it with anything through ODIN for it to operate better on the Telus network, or do I leave everything as is?
The benefit of the N950F is that you can flash custom ROMs on it correct?
Thanks
Click to expand...
Click to collapse
Yes the N950F is an Exynos model, so you can root like normal since it's not bootloader-locked like most Snapdragon models. I have a dual-sim N950F on Bell Canada, and didn't have to do anything special to get it working.
You can't flash Telus firmware on it, since Telus models are Snapdragon and the N950F is Exynos, but if you decide to root then you can always change your CSC to Telus. Not sure it will add anything important though, and it still works without changing CSC of course.
I recently purchased a N950F that was open box from eBay.
First thing I did was flash the latest build of Oreo, based on my CSC, and reset the device back to stock.
Inserted my Telus SIM and now I have full service with two exceptions:
On stock, you will only ever see 4G or 4G+ as your connection status. Can be changed with custom ROMs.
On Telus, Band 29 is unsupported.
So, in the majority of my daily usage, I have 4 bars out of 5 whereas on my N950U1 , I averaged 5.
Hey guys, I'm very confused with the amount of information around about the P30 Pro rebranding, FunkyHuawei doesn't support the P30 Pro as we know which leaves us to our own devices.
Here in the UK my P30 Pro is on contract (EE) and sim locked of course..
Unfortunately this means I'm on EE's firmware which is fine but slow to get updates, I'm on June still when August is already out...
My question is, is there ANY way I can change from C431 to C432 (or better) and get on to .193?, I imagine the sim lock will remain which is fine, I just want to get faster updates..
Sorry if y'all have been over this already I'm just trying the get a definitive answer in this thread
Note: am I correct in thinking C432 is the best/faster firmware for updates?
Thanks in advanced :highfive:
TheInfiniteAndroid said:
Hey guys, I'm very confused with the amount of information around about the P30 Pro rebranding, FunkyHuawei doesn't support the P30 Pro as we know which leaves us to our own devices.
Here in the UK my P30 Pro is on contract (EE) and sim locked of course..
Unfortunately this means I'm on EE's firmware which is fine but slow to get updates, I'm on June still when August is already out...
My question is, is there ANY way I can change from C431 to C432 (or better) and get on to .193?, I imagine the sim lock will remain which is fine, I just want to get faster updates..
Sorry if y'all have been over this already I'm just trying the get a definitive answer in this thread
Note: am I correct in thinking C432 is the best/faster firmware for updates?
Thanks in advanced :highfive:
Click to expand...
Click to collapse
As far as I'm aware with Huawei devices , changing firmware regions is not possible without root.
Sent from my SM-G975U using Tapatalk
TheInfiniteAndroid said:
Hey guys, I'm very confused with the amount of information around about the P30 Pro rebranding, FunkyHuawei doesn't support the P30 Pro as we know which leaves us to our own devices.
Here in the UK my P30 Pro is on contract (EE) and sim locked of course..
Unfortunately this means I'm on EE's firmware which is fine but slow to get updates, I'm on June still when August is already out...
My question is, is there ANY way I can change from C431 to C432 (or better) and get on to .193?, I imagine the sim lock will remain which is fine, I just want to get faster updates..
Sorry if y'all have been over this already I'm just trying the get a definitive answer in this thread
Note: am I correct in thinking C432 is the best/faster firmware for updates?
Thanks in advanced :highfive:
Click to expand...
Click to collapse
I'm on C431 on the non-Pro P30 and have the .193 August update, also on EE
Try the eRecovery method, and the Hisuite update method
Also read something about the carrier software only installing after inserting the SIM, to return to stock firmware remove the SIM card, factory reset the phone
*Detection* said:
I'm on C431 on the non-Pro P30 and have the .193 August update, also on EE
Try the eRecovery method, and the Hisuite update method
Also read something about the carrier software only installing after inserting the SIM, to return to stock firmware remove the SIM card, factory reset the phone
Click to expand...
Click to collapse
Thank you for the reply, strange that you're on the latest & I'm not, if you have time could you link any threads for either of the methods you mentioned please?
Assuming that doesn't work I'll try the factory reset as a last resort
TheInfiniteAndroid said:
Thank you for the reply, strange that you're on the latest & I'm not, if you have time could you link any threads for either of the methods you mentioned please?
Assuming that doesn't work I'll try the factory reset as a last resort
Click to expand...
Click to collapse
Install Hisuite on the PC
https://consumer.huawei.com/en/support/hisuite/
Enable the options in your phone it asks for, check for updates with the phone connected to PC USB
eRecovery - Power off the phone, Hold vol up & power until the white screen appears, choose the update/recovery option
Google has all the info you need
*Detection* said:
Install Hisuite on the PC
https://consumer.huawei.com/en/support/hisuite/
Enable the options in your phone it asks for, check for updates with the phone connected to PC USB
eRecovery - Power off the phone, Hold vol up & power until the white screen appears, choose the update/recovery option
Google has all the info you need
Click to expand...
Click to collapse
Worked like a charm, thank you very much for your help!
As to the C431 or C432, is that still a thing?, The reason I ask is because I had a Mate 10 Pro which was C782 & once rebranding to C432 I got updates so much faster
TheInfiniteAndroid said:
Worked like a charm, thank you very much for your help!
As to the C431 or C432, is that still a thing?, The reason I ask is because I had a Mate 10 Pro which was C782 & once rebranding to C432 I got updates so much faster
Click to expand...
Click to collapse
This is my first Huawei device so not sure about that yet, @SilviuO would be able to tell you more
TheInfiniteAndroid said:
Worked like a charm, thank you very much for your help!
As to the C431 or C432, is that still a thing?, The reason I ask is because I had a Mate 10 Pro which was C782 & once rebranding to C432 I got updates so much faster
Click to expand...
Click to collapse
*Detection* said:
This is my first Huawei device so not sure about that yet, @SilviuO would be able to tell you more
Click to expand...
Click to collapse
According to my knowledge/understanding,
C432 is global European
C431 is quite the same but with the ability to be directly custom by carriers inside the rom
You'll usually see c431 on phones sell by orange isp across Europe.
There's also the way to add a custom patch by the carrier with the sim, that's come with additional little patches on top of the main rom (any rom cust/region numbers in that case).
Warning [emoji615]
This is just my guess
So it could be so wrong
Let someone with real knowledge tell 'the truth'
Tapa'DoC'eD
O_DoC said:
According to my knowledge/understanding,
C432 is global European
C431 is quite the same but with the ability to be directly custom by carriers inside the rom
You'll usually see c431 on phones sell by orange isp across Europe.
There's also the way to add a custom patch by the carrier with the sim, that's come with additional little patches on top of the main rom (any rom cust/region numbers in that case).
Warning [emoji615]
This is just my guess
So it could be so wrong
Let someone with real knowledge tell 'the truth'
Tapa'DoC'eD
Click to expand...
Click to collapse
Yes, you're perfectly right.
C431 is sold (in Romania especially) by carriers (Orange, Vodafone, Telekom, Digi) and retailers too. The one sold by carriers has an update of their own when you inserted their SIM (ex. If you bought an C431 from Vodafone and you insert an Vodafone SIM, you will get an update from them and you're firmware will get customized, so for the next firmware you'll have to wait for Vodafone to approve and be delivered. If you insert another carrier SIM, you're phone will remain with the untouched firmware and get updates as Huawei release it, in batches).
C432 version is rare arround here, i didn't see any of that on the phones i saw (friends, reviews, on-line resellers) but the only difference between C431 and C432 is the ammount of apps preinstalled that you'll get when updating.
Cheers,
SilviuO
The carrier 'extra' patch I talked is the one which could spread through the sim and, afaik, be with any cust/region/csc devices ; but you can avoid/postpone it (even if getting annoying reminders).
C432 usually are from 'regular' shop. (mediamark, fnac, saturn, amazon...).
C431 from carrier or affiliated ones, even if it correctly said not simlocked for most of them. Note (global idea): Western european 'law' which 'forbid' to sim lock phone or if locked have the obligation to freely unlocked it after a short period if requested by customer.
C432 is, as you said, the 'best' for getting quicker updates in Europe. Said quoted because it's not only that, depend your country, carrier, imei, huawei id...and sometimes luck
C431 is almost the same but could be managed directly by your carrier for specific parameters like network management ('standard is for dummy' they certainly think...and proud of themselves) or services (WiFi calling is a good exemple) and you can't avoid it. But they also have stronger commitment against huawei like they can't 'sleep on it'. If not huawei will push c431 without waiting, that's why c431 and C432 is almost the same.
Again [emoji615]
These are my only understanding/guesses while surfing around in forum, spec sheets, etc...
I have no clue and no will to argue if someone say its not true.
Just sharing my 'experiences'.
Conclusion :
If you're going to use the phone mainly in Europe, go chase for a c432.
And I will add, if no need from services stucked/moved to some specific bands like cdma in america/japan or special regulations in some asian countries, c432 will also be the better hardware cust version.
Tapa'DoC'eD
SilviuO said:
Yes, you're perfectly right.
C431 is sold (in Romania especially) by carriers (Orange, Vodafone, Telekom, Digi) and retailers too. The one sold by carriers has an update of their own when you inserted their SIM (ex. If you bought an C431 from Vodafone and you insert an Vodafone SIM, you will get an update from them and you're firmware will get customized, so for the next firmware you'll have to wait for Vodafone to approve and be delivered. If you insert another carrier SIM, you're phone will remain with the untouched firmware and get updates as Huawei release it, in batches).
C432 version is rare arround here, i didn't see any of that on the phones i saw (friends, reviews, on-line resellers) but the only difference between C431 and C432 is the ammount of apps preinstalled that you'll get when updating.
Cheers,
SilviuO
Click to expand...
Click to collapse
Is there any way to tell if you get your updates from your carrier or direct from Huawei?
I have C431 on EE network in the UK, but there are no signs of EE anywhere in installed apps or branding
(ELE-L09)
*Detection* said:
Is there any way to tell if you get your updates from your carrier or direct from Huawei?
I have C431 on EE network in the UK, but there are no signs of EE anywhere in installed apps or branding
(ELE-L09)
Click to expand...
Click to collapse
Yes, the carriers updates will come long time after Huawei release the update for your device IMEI. Tested with someone who has Orange branded firmware. I received OTA ~ 1 week after it was released on FF and his device received it 3 weeks later (that happend before using HSTool method, i was like on firmware v158 or v161, kinda ).
If you don't have career related firmware installed on your phone, that means that you receive straight from Huawei servers.
SilviuO said:
Yes, the carriers updates will come long time after Huawei release the update for your device IMEI. Tested with someone who has Orange branded firmware. I received OTA ~ 1 week after it was released on FF and his device received it 3 weeks later (that happend before using HSTool method, i was like on firmware v158 or v161, kinda ).
If you don't have career related firmware installed on your phone, that means that you receive straight from Huawei servers.
Click to expand...
Click to collapse
There is no version number or code to say though? Just the speed of the updates?
With Samsung you could tell via the CSC for example VOD = Vodafone, BTU = Unbranded/Unlocked straight from Samsung
*Detection* said:
There is no version number or code to say though? Just the speed of the updates?
With Samsung you could tell via the CSC for example VOD = Vodafone, BTU = Unbranded/Unlocked straight from Samsung
Click to expand...
Click to collapse
Nope, there is no CSC code on Huawei or any other way to know. Before the P30 / P30 Pro, there was no C431 version, just C432 and the firmware was released / carrier branded as i described in my post reply, depending on the SIM / carrier or retailer from where you've bought your phone. Starting with P30 / P30 Pro versions, C431 was introduced as EEA firmware version (all the EU countries + Iceland, Liechtenstein and Norway + Switzerland) beside C432 as EU firmware (includes al EU contries without Iceland, Liechtenstein and Norway + Switzerland).
I get to those conclusions by checking the update info from the dload firmware inside Software folder (in those files you have all the info about the firmware updates -what security patches were applied, what errors have been resolved, for what carrier the firmware needs approval, etc-)
Anyway, regardless C431 is preffered by carriers and some retailers, you can always flash C432 or C10 firmwares over C431 without any problem, your cust will remain C431, but you'll install C432 firmware.
You can do that by dload method as i mentioned you or by HiSuite one (last one available for now only on EMUI 9.1 and maybe will work too on EMUI 10 but that we'll have to wait and see by mid November/early December when EMUI 10 will be out of beta and released globally).
Cheers,
SilviuO
With other S series devices there was a U and U1 model and only the U model supported AT&T WiFi calling.
Do we know yet if the same will be true of the S20 FE?
(As explained in other threads, with other S series devices it was the same hardware just different firmware and you can flash the phone to switch from one to the other)
I have the unlocked model from Best Buy and I'm on At&t. I don't see any option for wifi calling.
The Wi-Fi Calling app is installed on the phone, you can see the app in the list of system apps. I tried accessing it using Nova Activities & making a widget shortcut on the home screen but when I click on the icon it says permission denied. So it's there but Samsung / AT&T aren't letting us use it. I found this document, (I can't post the link since i'm a new user) google "service capabilities unlocked device att", which shows that previous unlocked Samsung Variants did not have Wi-fi calling on AT&T. Maybe there is a way to bypass the permission denied or access it? It's a deal breaker for me and I'll be returning the phone if it doesn't support Wi-Fi calling. I just signed up for a year of AT&T prepaid.
I was able to convert my Unlocked Model Firmware to the AT&T Firmware and now Wi-Fi Calling is enabled. It came with some other AT&T apps (Bloatware) but I don't mind since Wi-Fi Calling is a major plus for me. It's essentially an AT&T Branded Phone now except it has all the bands that the Unlocked version has.
Would you please care to elaborate how you did it? I’ve tried the typical Odin process with no success
cabegol said:
Would you please care to elaborate how you did it? I’ve tried the typical Odin process with no success
Click to expand...
Click to collapse
Sure, First make sure you have the Samsung USB Drivers installed. You can find it on the support page of the S20 FE. I Downloaded Frija 1.4.2 in order to get the latest Firmware. Model "SM-G781U", CSC "TMB" for the U.S Version. As I understand the Carrier versions are all the same and will load up the correct one based on the sim card you have in your device. I downloaded Odin 3.14.4. Unzipped and placed the correct files into Odin, I did the non Home CSC file and left USERDATA blank because Samsung switches the version based on your sim card. Put your phone in Download mode. I got an error the first time but switched to a different USB and it flashed it to the AT&T version.
Thank you!
---------- Post added at 09:23 AM ---------- Previous post was at 08:34 AM ----------
I've done this process numerous times (with success) but with this S20 FE from TMO the XAA firmware does not prompt me to reboot on SIM change (carrier change). I've found that this process works flawlessly to change the CSC:
Go to "Settings" then "About phone". Write down your IMEI Number. Open dialer and enter *#272*IMEInumber# (In the thread replace IMEInumber with your actual IMEI Number). Press dial, you should see a screen with the list of available CSC codes for your device. Select the CSC that you want and tap the Install option.
In my case, this won't wipe the data on the phone, your experience may vary.
Another note: if you're using the "U" firmware, a CSC change will prompt the installation of carrier bloatware upon reboot. If the "U1" version of the firmware is used, the carrier changes but without the added bloatware.
Donatelloj said:
I was able to convert my Unlocked Model Firmware to the AT&T Firmware and now Wi-Fi Calling is enabled. It came with some other AT&T apps (Bloatware) but I don't mind since Wi-Fi Calling is a major plus for me. It's essentially an AT&T Branded Phone now except it has all the bands that the Unlocked version has.
Click to expand...
Click to collapse
where did you download the roms from is it the same model as the regular s20 unlocked ones or ?
Can someone confirm the *#272*IMEInumber# does, indeed, work on the unlocked S20 FE sold in US? What CSCs are available? Can you really switch between them without losing data? Do any of the available CSCs have eSIM enabled? What about native call recording? Which ones?
badazzbubbanc said:
where did you download the roms from is it the same model as the regular s20 unlocked ones or ?
Click to expand...
Click to collapse
No, use Frija 1.4.2. It has the lastest Firmware for the S20 FE.
I'm using an AT&T MVNO and I am able to get wifi calling. I popped my sim in during the setup process and it rebooted a few times. No bloatware or anything. I think as long as it's the first sim in the phone, it should do the trick.
Donatelloj said:
No, use Frija 1.4.2. It has the lastest Firmware for the S20 FE.
Click to expand...
Click to collapse
You know what I needed to type to get unlocked U.S XAA? Been searching and no luck.
Sent from my SM-G781U using Tapatalk
I have the SM-G781U1. Tried the *#272*IMEInumber# trick but after I change the CSC to XAA, the phone reboots twice and goes back to previous CSC (ATT) with no Wi-Fi calling. Also, cannot find any firmware for this model on Frija. What is the difference with the SM-G781U?
raptor1983 said:
I have the SM-G781U1. Tried the *#272*IMEInumber# trick but after I change the CSC to XAA, the phone reboots twice and goes back to previous CSC (ATT) with no Wi-Fi calling. Also, cannot find any firmware for this model on Frija. What is the difference with the SM-G781U?
Click to expand...
Click to collapse
What you trying to flash At&t firmware?
Sent from my SM-G781U1 using Tapatalk
x1tymez said:
What you trying to flash At&t firmware?
Sent from my SM-G781U1 using Tapatalk
Click to expand...
Click to collapse
Yes, I need wifi calling.
raptor1983 said:
Yes, I need wifi calling.
Click to expand...
Click to collapse
Last I checked there's none at&t firmware. You should wait for now. Terrible, At&t still don't play nice with unlocked phone.
Sent from my SM-G781U1 using Tapatalk
x1tymez said:
Last I checked there's none at&t firmware. You should wait for now. Terrible, At&t still don't play nice with unlocked phone.
Sent from my SM-G781U1 using Tapatalk
Click to expand...
Click to collapse
I'll wait. Thank you.
Donatelloj said:
I was able to convert my Unlocked Model Firmware to the AT&T Firmware and now Wi-Fi Calling is enabled. It came with some other AT&T apps (Bloatware) but I don't mind since Wi-Fi Calling is a major plus for me. It's essentially an AT&T Branded Phone now except it has all the bands that the Unlocked version has.
Click to expand...
Click to collapse
So you were able to convert firmware on G781U1 to AT&T G781U for Wifi Calling? In regards to bands, if you switched firmware from AT&T to unlocked, shouldn't it also enable all the unlocked model bands?
Zac2 said:
So you were able to convert firmware on G781U1 to AT&T G781U for Wifi Calling? In regards to bands, if you switched firmware from AT&T to unlocked, shouldn't it also enable all the unlocked model bands?
Click to expand...
Click to collapse
I confirm what posted by Donatelloj. Starting from SM-G781U1, I installed firmware for SM-G781U (CSC TMB) with no USERDATA and Wi-Fi calling is working now! I had an issue with the fingerprint sensor not working but after 2 reboots everything looks fine. Now having troubles syncing Gallery with OneDrive but I believe this is a different story.
I've just installed unbranded Android 11 (G781U1UES1CUA2) on US unlocked SM-G781U1 and ATT Wi-Fi calling is working. No need for branded firmware anymore.
I have an unlocked S20 FE 5G purchased from Three UK, and i'm trying to debrand it by replacing its factory android from three with the H3G csc code with an unlocked firmware with the BTU csc code, however when i try to flash with odin it stays the same (three uk bootlogo, three uk bloatware, H3G csc code). How can i properly debrand the phone and also change its CSC to BTU?
Hi how did you resolve this, please
Thanks
Hello, I'm not a developer; I've never dealt with a rooted device, but Google, Samsung, Verizon and other sources were no help, so I'm here now.
I got a Samsung S20 FE from my old workplace which was previously locked to the ATT network. I am a Verizon customer so I wanted to switch over and I purchased an unlock code from cellunlocker.net. I've reached out to Cellunlocke, but they say the unlock was successful as it is connecting to the VZW network.
I did a factory reset on the phone, put in the Verizon Sim card, and used the network unlock code provided. The unlock said it was successful, but the phone powered on with the ATT logo and downloaded all the ATT factory apps. When I go into the phone dialer settings, it shows ATT video calling, etc... The phone software version shows ATT in the service provider sw version. But it makes calls, texts, etc. and the network settings show it's connected to VZW. The problem is, that it can't access my voicemail or use wifi calling because it's set with the ATT apps and features.
I've tried removing the sim, power cycling, factory resetting, even calling Verizon and asking them to resync the phone to the network. When the sim card is installed in the new phone, VZW shows the S20 as my device, but the phone still thinks it is on the ATT settings. I've viewed the Service Menu *#0011# and it shows that the phone is unlocked.
The phone is showing a service provider software version of
SAOMC_SM-G781U_OYN_ATT_12_0012
ATT/ATT/ATT
Is there any way to force the phone to reset its carrier settings or service provider software? Also, please keep it somewhat simple; I'm learning but not an expert here!
about the only wise thing you can do is download and XAA U1 firmware (Samsung non carrier firmware) flash that with Odin and call it good.
you're getting what you're seeing because the phone won't be able to switch to Verizon firmware as Verizon actually have their own unique version of the FE SM-G781V I believe with physical differences for Verizon's mmwave 5G and the U model can't reset itself to that.
3mel said:
about the only wise thing you can do is download and XAA U1 firmware (Samsung non carrier firmware) flash that with Odin and call it good.
you're getting what you're seeing because the phone won't be able to switch to Verizon firmware as Verizon actually have their own unique version of the FE SM-G781V I believe with physical differences for Verizon's mmwave 5G and the U model can't reset itself to that.
Click to expand...
Click to collapse
So which firmware version do I need? The model printed on the phone is SM-G781u. SamMobile has 781O, B, U, U1, and V for the 781 model.
I'd love to have it without the bloatware Verizon installs, but I need Wifi calling to work and it seems to be a setting in the dialer, rather than the phone.
tbrou6229 said:
So which firmware version do I need? The model printed on the phone is SM-G781u. SamMobile has 781O, B, U, U1, and V for the 781 model.
I'd love to have it without the bloatware Verizon installs, but I need Wifi calling to work and it seems to be a setting in the dialer, rather than the phone.
Click to expand...
Click to collapse
flashing V would be a bad idea, 5G wouldn't work, at least not well. so that leaves U1 which is Samsung unbranded, no carrier apps at all.
3mel said:
flashing V would be a bad idea, 5G wouldn't work, at least not well. so that leaves U1 which is Samsung unbranded, no carrier apps at all.
Click to expand...
Click to collapse
Ok thank you, I'll give it a shot
3mel said:
flashing V would be a bad idea, 5G wouldn't work, at least not well. so that leaves U1 which is Samsung unbranded, no carrier apps at all.
Click to expand...
Click to collapse
I'm looking at the instructions for flashing the device and the instructions say to turn on OEM Unlocking in developer options. I've activated developer options and USB debugging, but do not have the option to turn on OEM Unlocking.
I can't seem to find a way to unlock the bootloader.
tbrou6229 said:
I'm looking at the instructions for flashing the device and the instructions say to turn on OEM Unlocking in developer options. I've activated developer options and USB debugging, but do not have the option to turn on OEM Unlocking.
I can't seem to find a way to unlock the bootloader.
Click to expand...
Click to collapse
to the best of my knowledge you don't need to be unlocked in order to flash signed, official Samsung firmware. many Americans have cross-flashed their phones and none of them could unlock either.
you're just booting into download and opening Odin, it's not much more than that.
3mel said:
to the best of my knowledge you don't need to be unlocked in order to flash signed, official Samsung firmware. many Americans have cross-flashed their phones and none of them could unlock either.
you're just booting into download and opening Odin, it's not much more than that.
Click to expand...
Click to collapse
Awesome, a flash using ODIN seems to have worked; the phone is active and not showing any carrier apps or splash screen. I'm having some other issues; can you suggest which firmware combo would be best?
I used Sammobile.com SM-G781U1 with Country Code USA (Verizon) (VZW)
OR I also downloaded Frija SM-G781U1 with CSC of XAA
Will I notice any major differences in them, or just try each one and check it out?
I am in the US, using the Verizon network. We do not have 5g in the area but the phone and our verizon plan is 5G capable and I would like the option if it exists somewhere I travel to.
I am in the UK, I shouldn't be telling you anything about what firmware is gonna be best over there.
other than U1 XAA I can't tell you much. also be aware that generally you can never downgrade your firmware unless it has the same bootloader version as what you're currently using...
if we were looking at my firmware version number G781BXXU4FVE6
I can only flash something that has a matching 5th last character, that's a 4 in this case. I can only download and flash older firmware if it also has a 4 in the same place in the build number. the phone won't accept anything else.
Sammobile is good for seeing what firmware exists but it's terrible for download speeds. I use Frija mainly but that only gives me the latest version nothing historical.
@3mel thank you for all your help! I've got this device working well on the U1 software and didn't have to reflash it; the rest of my issues resolved. Thanks for your patience in helping this newbie do things to a phone I never would have attempted otherwise!