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.
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Hi I was wondering if any bell or more appropriately Sasktel users are using any gingerbread roms and how the csc and modem is working out.
Sent from my Iphone killing I9000
I'm on Bell, used to run CyanogenMod7, now I'm testing out the latest MIUI gingerbread builds. The modem seems to work fine enough (either JL2 or KC1). I haven't had any issues. Battery efficiency could be better, but I'm not convinced that's the modem's fault.
So other than battery probs are you happy. Also all you did is flash the rom and then a new modem
Sent from my Iphone killing I9000
Yeah, I'm on Rogers with CM7 and KC1 Modem, running smooth with great speeds on my 3g+ I just noticed your other post and yes I flashed the ROM and then the Canadian modem
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
Hi all,
Just wanted some feedback from anyone with the Bell Mobility I9000M that has flashed JVH. How are you liking the update?
As well:
Is 850Mhz supported? If not can we flash another modem over to enable 850? How has the reception been compared to JL2?
How is the battery life compared to 2.2 Roms? I am currently on a Doc 2.2 JS8 Rom and get about 2 days with moderate use.
Thanks!
JVB was really good, needed to preform the 850 fix or flash a new modem (I always flash ugkc1) bettery was pretty good
JVH I just flashed and modem needs same as JVB fix or flash of an 850 default... can't say for battery yet, most are saying it takes some calibration on JVH... GPS fix is best I have ever had.
I was Doc 9.5 moved to Doc 10 rc6, moved to simply honey now on juwe... liked doc 10 the least.
works fine here. JVH with KC1 modem
Do any of the 2.3 based modems support 850mhz for 3g?
I've tried JVH and JVO, but neither seem grab an 850mhz signal. I've gone into secret codes and added 850 to the combi bands, but the phone never grabs 850.
This leaves me sitting on edge while at home, with weak signal. On 2.2 based roms I have no problem with the various modems that support 850mhz for 3g.
This is on a Bell i9000m.
Flash JL2, set 850 as the only one, then flash JPD then you'll be able to flash anyone you'd want.
t1mman said:
Flash JL2, set 850 as the only one, then flash JPD then you'll be able to flash anyone you'd want.
Click to expand...
Click to collapse
those will work ok on a gingerbread based rom? They were released with froyo roms, just want to make sure I am not going to kill anything.
GreenEnvy said:
those will work ok on a gingerbread based rom? They were released with froyo roms, just want to make sure I am not going to kill anything.
Click to expand...
Click to collapse
The modem files are firmware agnostic....they can be used with either froyo or gingerbread.
Sent from my GT-I9000 using XDA Premium App
Thanks guys.
Did as directed:
Flashed JL2, set it to 850 only, rebooted, flashed jpd, rebooted, flashed jq1, set it back to auto and added 850 to combi.
Seems to be working!
I installed miui 2.8.3 today...my about phone says
base band
I9000 UGKC1
Shouldn't it be 1897UCKB1?
I have an AT&T captivate 1897....what should I do?
Thanks
You're in good shape. MIUI is a Cyanogen-based Rom, so it uses a different modem (UGKC1, in this case, which is an I9000 modem). The I9000 is the international Galaxy S version of our phone, and things that run on it will often run on the Captivate.
Check out Oxicotton's modem thread, I think you'll find some good info there.