Was wondering y some roms change the baseband of my phone and wad does baseband do to the phone? Mine is I9000ZSJPG.
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the baseband refers to the modem you have installed. Most roms include the specific modem with the firmware they are using, which may or may not be optimal for your location. You can change the modem to another compatible version easily either using odin or more usually a cwm zip file.
People mix and match modems for a variety of reasons, especially band coverage (850 band), gps performance and battery life.
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From my understanding... a i9000 base rom should be used with an i9000 modem and kernel. At the same time a captivate base rom should be used with a captivate based modem. Please correct me if this is not true.
Now, what I don't understand is why are there roms that mix it up? Firefly uses the rogers Froyo.. which is JL1 captivate base rom, but at the same time use a JK4 modem which is i9000 from bell.
I'm not exactly sure where JPY, JS3 and more recently JS5 came from either.
generally using a an att or rogers rom will be incompatable with another modem. not that the phone wont work but you lose bluetooth audio. it is posible that this doesn't apply to the official rogers froyo or that they have accepted this as a minor compromise for adding hsupa.
i dont know of another reason to match modem to anything, many say to match it to the kernel but in the case of an att rom that doesn't help any, and i have run t959d modems on i9000 kernels and roms and there are no ill effects. so that theory is out.
some even like to run captivate modems on other roms giving up hsupa because they get more stable results.
really the non rogers/att modem on a rogers/att rom is the only known problem. all other "rules" are mearly safe suggestions, but if we did things the safe way all the time we wouldn't learn anything.
the only other criteria to choose a modem is that on att or in canada you want to use a modem that defaults to the 850 band. basically if you want hsupa use a bell or telus modem on i9000 kernel and non att/rogers rom. there are also chinese and austrailian and newzeland and other modems that work just fine. i find the kp1 from china to be the most versitile. i think the modem has all the bands so it's better for international use and i get the most satalites with it though the positioning is less stable untill you tweak the gps settings a little.
@ dani897 are you meaning the kp1 has all 5 wcdma bands enabled? i know of 850/900/1700/1900/2100 that would be handy.... is there any known draw backs or just try and see? it would be nice to change countries/carriers without finding/ flashing a new modem. great info thanks.
Hi i have a question about allowing the hspa network on stock froyo rom....
How would i go about doing this?
Flash a new modem? Possible one from an hspa capible device like the i9000?
Sent from my SAMSUNG-SGH-I897 using XDA App
http://tinyurl.com/66n2a6t
Sent from my SAMSUNG-SGH-I897 using XDA Premium App
Would i also have to use an i9000 kernel or could i use my current existz voodoo kernel?
Sent from my SAMSUNG-SGH-I897 using XDA App
Kernels have to match modems. kb1 to kb1, i9000 to i9000.
So is running a i9000 kernal better than using a captivate kernal?
if so what are the pros and cons if any?
rom kernal match
Look. I've tried different kernals with stock froyo 2.2 and learned the hard way with sticking with stock modem. Call quality was crap and battery life severly dimished with having a improper mix of modems and kernals. Since those mistakes I run continuum 4 with onix kernal 2.05 and jvk modem and have great batt life and call quality and download speeds are phenomenal. The best way I have found without going flash crazy is to see what the experienced people are using on their phones. The have it listed in their stats at the bottom of each posting they make. These people have been modding for awhile and know by experience what works best. Try that and you should have no problems getting the best combo for your captivate. Hope this answers your question. Good luck!
hsupa is over rated the phone already has hsdpa. hsupa may be good if you want to video chat or teather. but if you must get hspa in full you want to flash a different rom. no one has figured out a workaround for the brokn bluetooth calling with a rom/modem mismatch on a north american captivate rom.
as for the kernel, well i haven't tried an i9000 or i9010 or i9088 kernel on kb1 but they all should work. also i haven't tried changing the modem without changing the kernel but i believe that should also work. even if it is not recomended. i have never adhered to the notion that modems and kernels should match and had good luck with modems for t959d i9000m and i9088 on i9000 i9010 and i9088 kernels without major problems. it does seem that the older modems do not work all that great on the captivate with call volume or quality problems regardless of rom and kernel. but the kp1 from i9088 and kc1 from i9000 are both great on the captivate, i think i give kc1 the edge. if it weren't for those two and maybe others that i didn't try i would recomend leaving it all kb1 for the simple fact that a phone should make good phone calls.
the adage that the modem and kernel must match is true. ie. i9000 kernel/i9000 modem i897 kernel/i897 modem....it is absolutely true you must match those. if you use an i897 modem with an i9000 kernel or vice versa, you will have data but no voice. its not just a myth
i need to know what modem have the best modem for wifi
thx
Modems don't affect wifi. Wifi is located in the kernel, I believe.
Sent from my GT-I9000 using XDA Premium App
for me best for wifi was JVE (from first GB leak) and current JVR modem
@rschenck dload some firmwares, extract modems, dload My network Info II from market, and flash modem one after another. you will se change in parameters ;]
i use the new jvr and i dont think its any good
My current modem version is I9000XXJQ1 and I have done the *#2263# drill to select 2100 & 850 bands (WCDMA) which my carrier supports.
However, when I check what is being used via *#0011#, only 2100 shows up.
I never see 850.
What am I doing wrong ?
your modem might not support the 850 mhz band, that sounds like an i9000 modem
stewi21 said:
your modem might not support the 850 mhz band, that sounds like an i9000 modem
Click to expand...
Click to collapse
I found the following thread:
http://forum.xda-developers.com/showthread.php?t=876391
where my modem is listed as including the 850 band.
There is a comment in that thread which I don't really understand:
"A I9000 based kernel (reoriented) is required for the I9000 modems to be usable on the Captivate"
What rom/kernel are you running?
Sent from my I897 using XDA App
And it means that ur kernel needs to be based off an i9000 kernel not a i897 kernel, most kernels say in their dev thread. Have a look at the talondev thread for example
Sent from my I897 using XDA App
The thread posted is where you need to start.
As the post above says...i9000 kernel/i9000 modem...i987 kernel/i987 modem.
Follow the directions on the thread posted to the T! and you'll be fine. It is all very simple.
stewi21 said:
What rom/kernel are you running?
Sent from my I897 using XDA App
Click to expand...
Click to collapse
The kernel is: 2.6.32.9 [email protected] #32
Rom: Pilotx v4.0 final XWJS8
you can also try this. It is fast and easy
http://forum.xda-developers.com/showthread.php?t=1189241
popfan said:
you can also try this. It is fast and easy
http://forum.xda-developers.com/showthread.php?t=1189241
Click to expand...
Click to collapse
Would this trick allow me to lock into 850 as first choice and 2100 as the alternate ? currently it seems that 2100 always gets picked.
not sure if ur kernel is a captivate based one or not, maybe just ask in the threat what modems are compatible with it
kalda01 said:
Would this trick allow me to lock into 850 as first choice and 2100 as the alternate ? currently it seems that 2100 always gets picked.
Click to expand...
Click to collapse
Yes, it will
If currently I have the XXJQ1 modem which is I9000 based, should there be an issue if I switch to UGJL2 which is also listed as I9000 based?
The only problem I have with the current modem is the fact that 850 is never utilized. only 2100.
I have read posts from other captivate owners using same kernel that UGJL2 worked for them.
One question though, can I flash the modem using Recovery from the external SD card ?
Asking again if UGJL2 should work with my 2.2.1 based rom.
Using a kc1 modem on my i9000 Cappy. Have band set to automatic. Awesome speed and all bands.
Have you flashed the kc1 or was it part of the rom ? are you on 2.2.1 or 2.3 ?
kalda01 said:
The kernel is: 2.6.32.9 [email protected] #32
Rom: Pilotx v4.0 final XWJS8
Click to expand...
Click to collapse
Looking at the above it appears that you on a I897 rom and kernal. You would need to use an I897 based modem. I9000 modems might not work properly.
From the modem thread original post:
"A I9000 based kernel (reoriented) is required for the I9000 modems to be usable on the Captivate"
There are a few I897 modems floating around. KB1 is one and KH3 is new.
I'm a bit conused as my current modem is XXJQ1 and it is listed as I9000 based and not I897 based. the modem works fine except the fact that only band 2100 is used and not 850. How does a I9000 based modem work at all ?
Can someone explain that to me ?
Dear all devs,
I am little bit confused with basebands,
When i had deodexed rom by rajrocks and stock kernal,
I was able to use 3G speed on 2G pack,
But after flashing razodroid , it changed my baseband to DLD1 now that 3G tweak is not working.
I want to know that how can i get my stock baseband back??
Winners dont do different things,
They do thing differently
mehul_crazybond said:
Dear all devs,
I am little bit confused with basebands,
When i had deodexed rom by rajrocks and stock kernal,
I was able to use 3G speed on 2G pack,
But after flashing razodroid , it changed my baseband to DLD1 now that 3G tweak is not working.
I want to know that how can i get my stock baseband back??
Winners dont do different things,
They do thing differently
Click to expand...
Click to collapse
Only flash baseband (modem) with Odin.
cooperke said:
Only flash baseband (modem) with Odin.
Click to expand...
Click to collapse
How to find the stock baseband that was in my device??
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Use binomial distribution for successive events
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