Database Develop

Problem to install ICSSGS RC 4.1

I try to install but don't work... after that i flash it, the phone lock to logo screen "google" and i can't go to CWM i must use odin to reflash. If install rc3.1 it's all ok.
Where is the problem?
Thanks.

Did you try looking at the help page on the thread in the development section? It's right before the post is finished, there will be a link that will lead you there.
Hope that helps, if not I can try to just copy and paste the instructions hahaha

scheccia said:
I try to install but don't work... after that i flash it, the phone lock to logo screen "google" and i can't go to CWM i must use odin to reflash. If install rc3.1 it's all ok.
Where is the problem?
Thanks.
Click to expand...
Click to collapse
Did you do a full wipe before flashing RC4.1?

kabracity said:
Did you do a full wipe before flashing RC4.1?
Click to expand...
Click to collapse
yes... i try to flash a miui rom first also.
I try to do a full wipe... i try to install a original rom... but when i flash rc4.1 the phone stuck to logo.

Ensure you have backed up your EFS directory; if you don't know how ask.
To be honest, there appears to be some inconsistency in the reliability of the 4.1 RC release (across handsets); I have had persistent WIFI issues and then when the wifi fix was released I found the phone to just be a little laggy.
My advice if RC 3.1 works well for you is to keep it on there for now and wait for the next release they make.
However, if you still wish to flash it, there is no 100% working way - just keep factory reset, dalvik wipe, cache wipe, reset until it starts working! That's what I did as the original instructions did not work for me.

torrentship said:
Ensure you have backed up your EFS directory; if you don't know how ask.
To be honest, there appears to be some inconsistency in the reliability of the 4.1 RC release (across handsets); I have had persistent WIFI issues and then when the wifi fix was released I found the phone to just be a little laggy.
My advice if RC 3.1 works well for you is to keep it on there for now and wait for the next release they make.
However, if you still wish to flash it, there is no 100% working way - just keep factory reset, dalvik wipe, cache wipe, reset until it starts working! That's what I did as the original instructions did not work for me.
Click to expand...
Click to collapse
I agree with you... RC3 was fine for me... fast and all worked... RC4 has some wifi issues... It switch on/off and doesnt stop till i reboot the phone... im thinking about to downgrade to RC3.1 and wait till the next release...
Sent from my GT-I9000 using XDA App

torrentship said:
However, if you still wish to flash it, there is no 100% working way - just keep factory reset, dalvik wipe, cache wipe, reset until it starts working! That's what I did as the original instructions did not work for me.
Click to expand...
Click to collapse
Yes i try it(no backup efs)
If i flash 2 time the rom the phone stuck it and i can't enter in cmw
.. is the only rom that give me this problem... bha...

Hello, have you tried to download the rom again? Maybe it's a bad download..

That's odd, for me i got stats 7 but was because i was flashing the I9000B version and my phone was with the CWM for I9000. Try using odin and flash a sotck rom, after that install the CWM and then the RC4.1.
If anyone want to know the procedure that i do to install the RC4.1 is this:
Starting for CM7 --> flash the ARO 2.3.3 rom to re-write the bootloader (check this option in odin) --> flash the ZTO 2.2 rom to re-partition in original size partitions --> flash the 2.2.1 ARO because it's a nice rom and don't have all the trash that is present in ZTO version --> through kies flahs the ARO 2.3.3 original.
After that the procedure to install the RC4.1 is the standard: flash CWM then install the ROM.

I had problems going from 3.1 to 4.1. Same issue as OP.
Process I followed:
-Flashed CWM through heimdall
-Flashed devil kernel
-Flashed CM7 (had to do this twice in a row)
-Flashed ICSSGS 3.1
-Flashed 4.1 but before I rebooted my phone, I flashed Devil one last time.
Since then, phone has been rocking along just fine!
Sent from my GT-I9000 using Tapatalk

Bena1988 said:
Hello, have you tried to download the rom again? Maybe it's a bad download..
Click to expand...
Click to collapse
Yes... three times.

I'm having the same problem here.
I tried the first point on the Common Issues page but I'm still not able to go into CWM!
I flashed the Speemod Kernel using heimdll but I can't go back to CM7. I'm getting a Stat 7 error.
Also tried the Devils kernel (Devil_1.0_CFS) with no help ....
Any ideas?

Just wondering...
MaesterB said:
I had problems going from 3.1 to 4.1. Same issue as OP.
Process I followed:
-Flashed CWM through heimdall
-Flashed devil kernel
-Flashed CM7 (had to do this twice in a row)
-Flashed ICSSGS 3.1
-Flashed 4.1 but before I rebooted my phone, I flashed Devil one last time.
Since then, phone has been rocking along just fine!
Sent from my GT-I9000 using Tapatalk
Click to expand...
Click to collapse
why on earth did you flash the CM7 as a part of the process? I always have just downloaded an appropriate kernel (devil, stockplus etc..) + ICS ROM (latest was RC4.1), once I'd rooted my stock 2.3.6 ROM with CF-Root (takes only 5 minutes). ICSSGS' ROMs can be applied straight on top of any previous ROM, the only requirement is that you have root privileges + CWM installed. Flashing CM7 is often frustrating, at least for me. I personally see no point in flashing it before the ICS ROM. If you know better, pleasy enlighten me

Arvokm said:
why on earth did you flash the CM7 as a part of the process? I always have just downloaded an appropriate kernel (devil, stockplus etc..) + ICS ROM (latest was RC4.1), once I'd rooted my stock 2.3.6 ROM with CF-Root (takes only 5 minutes). ICSSGS' ROMs can be applied straight on top of any previous ROM, the only requirement is that you have root privileges + CWM installed. Flashing CM7 is often frustrating, at least for me. I personally see no point in flashing it before the ICS ROM. If you know better, pleasy enlighten me
Click to expand...
Click to collapse
Thats the way I do all went well...
Sent from my GT-I9000 using XDA App

[Q] Question about Flashing ICS

I want to Flash Team ICSSGS [Android 4.0.3] (Link to ROM Thread) but I am not for sure what Bootloaders or Kernel I need to use.
I currently have:
Firmware Version: 2.2
Baseband Version: I897UCKB1
Kernel Version: 2.6.32.9
Build Number: FROYO.UCKB1

In general, the Gingerbread bootloaders are preferred with any of the ICS ROMs, because they are more ubiquitous and can be used with virtually any version 2.1 thru 4.0. Kernel-wise, the ICS ROMs come with a kernel, and your only other option is Glitch v14 beta right now...but mostly, you shouldn't need to worry about flashing anything beyond what's in the ROM itself right now.

WindRunnerXC said:
In general, the Gingerbread bootloaders are preferred with any of the ICS ROMs, because they are more ubiquitous and can be used with virtually any version 2.1 thru 4.0. Kernel-wise, the ICS ROMs come with a kernel, and your only other option is Glitch v14 beta right now...but mostly, you shouldn't need to worry about flashing anything beyond what's in the ROM itself right now.
Click to expand...
Click to collapse
So that ROM I listed in my OP comes with its own Kernel?
And is there a particular Bootloader I should use?
If there is, may you please link me to it?

Hey im currently running the ROM you are asking about. To answer your questions you have to be on the gingerbread bootloaders. You can flash those using odin, or since there is an official update out, use Kies mini to update your phone to gingerbread and that will flash the bootloaders for you.
About the kernel, the ROM you posted includes a kernel in the .zip and when you install the .zip it will flash the kernel for you. Its a fine kernel and works great so dont worry about changing it unless you have problems.
Here is the link on how to flash the bootloaders using Odin. Its not a hard process and pretty safe so let us know how you come out on the other side!
http://forum.xda-developers.com/showthread.php?t=1129821&highlight=gingerbread+bootloader

capocaccia said:
Hey im currently running the ROM you are asking about. To answer your questions you have to be on the gingerbread bootloaders. You can flash those using odin, or since there is an official update out, use Kies mini to update your phone to gingerbread and that will flash the bootloaders for you.
About the kernel, the ROM you posted includes a kernel in the .zip and when you install the .zip it will flash the kernel for you. Its a fine kernel and works great so dont worry about changing it unless you have problems.
Here is the link on how to flash the bootloaders using Odin. Its not a hard process and pretty safe so let us know how you come out on the other side!
http://forum.xda-developers.com/showthread.php?t=1129821&highlight=gingerbread+bootloader
Click to expand...
Click to collapse
Now when I flash this bootloader you listed, will Froyo still boot or will I have to flash my ROM afterwards?

froyo will still boot. GB BL are backwards compatible and the ISCSGS script should allow it to flash over any ROM

Hi all.
as i can't post yet in a thread mentioned by mrnapolean1 (http://forum.xda-developers.com/showthread.php?t=1362092) I'll try to ask my question here, as it related to a question asked by this thread starter
so i have gingerbread 2.3.5, installed CornKernel_UCKK4_v603 and custom rom SimplyStock KK4 V1.0 , so if i wanted to switch Team ICSSGS [Android 4.0.3] should i do following?
1. wipe data /factory reset
2.wipe system
3.flash from recovery mode Android 4.0.3 zip?
I already have a backup made with Efs Pro as a tar file
anything else i need to do?
thank you so much in advance

mrnapolean1 said:
Now when I flash this bootloader you listed, will Froyo still boot or will I have to flash my ROM afterwards?
Click to expand...
Click to collapse
Yes, Froyo will still boot. If this were a layer cake it would go something like bootloader, kernel, rom. So basically, your bootloader has nothing to do with your kernel or your rom but it is at the bottom layer of the boot process. It does effect which ROMs you can use though as gingerbread and ICS roms require GB bootloaders. So flash the bootloaders, you will still be on Froyo. Update to GB. Root GB. Place the ROM on your internal SD and then flash it. If you run into any problems check the common problems page found on the first page of the SGSICS ROM.
gugman said:
Hi all.
as i can't post yet in a thread mentioned by mrnapolean1 (http://forum.xda-developers.com/showthread.php?t=1362092) I'll try to ask my question here, as it related to a question asked by this thread starter
so i have gingerbread 2.3.5, installed CornKernel_UCKK4_v603 and custom rom SimplyStock KK4 V1.0 , so if i wanted to switch Team ICSSGS [Android 4.0.3] should i do following?
1. wipe data /factory reset
2.wipe system
3.flash from recovery mode Android 4.0.3 zip?
I already have a backup made with Efs Pro as a tar file
anything else i need to do?
thank you so much in advance
Click to expand...
Click to collapse
First, if you want to keep any of your apps or contacts backup those as well using Titanium Backup. Make sure to backup to the External SD card or make a copy of the backup somewhere other than the phones internal SD.
Second, you dont have to wipe data/factory reset before you flash. This is only if you have the problem of a bootloop when you try to install. I had this problem and when I did the wipe data afterward it fixed it immediately. So follow this:
1: Boot into CWM
2: install rom
IF you have an issue with a boot loop at this point
1: Get back into CWM using the button combination
2: Wipe data/Factory Rest and Wipe Cach

capocaccia
thank you !
one more question, i understood about data/factory/cash, but dont i need to format system before flashing new rom? i thought its always better to do before new rom flashing?

gugman said:
capocaccia
thank you !
one more question, i understood about data/factory/cash, but dont i need to format system before flashing new rom? i thought its always better to do before new rom flashing?
Click to expand...
Click to collapse
I think this was true when flashing older roms. When I flashed that ROM I did not format system and it worked fine. Let me know if you have any problems when you flash.

capocaccia said:
I think this was true when flashing older roms. When I flashed that ROM I did not format system and it worked fine. Let me know if you have any problems when you flash.
Click to expand...
Click to collapse
i see. okey, thanx a lot again. will be able to flash in about an hour and will let you know

after flashing all went good and phone booted with no problem, except that i don't have a wi-fi, it is connected after typing my password in, wifi icon is on home screen, but could not enter any website or connect to my google account. any ideas?

Try flashing this: http://code.google.com/p/ice-cream-.../detail?name=WifiFix.zip&can=2&q=#makechanges
Sent from my Captivate running Android 4.0.3 ICS

capocaccia said:
Try flashing this: http://code.google.com/p/ice-cream-.../detail?name=WifiFix.zip&can=2&q=#makechanges
Sent from my Captivate running Android 4.0.3 ICS
Click to expand...
Click to collapse
so after flashing that file my phone gives me screen like this
Power Reset or Uknown Upload Mode
and it is stucked. so may i pull the battery off and go to recovery mode again and go back to my previous room? should i perform system format in this case?

Try to reboot. If it won't reboot then ask around in the icssgs Q and A thread.
Sent from my Captivate running Android 4.0.3 ICS

capocaccia said:
Try to reboot. If it won't reboot then ask around in the icssgs Q and A thread.
Sent from my Captivate running Android 4.0.3 ICS
Click to expand...
Click to collapse
with keys+power button combination i've been able to exit that screen and reinstalled 4.0.3
do you know safe way how do i go back to SimplyStock KK4 V1.0? should i first flash CornKernel_UCKK4_v603 with odin? but is it safe to do over android 4.0.3?
sorry for bothering you, but i am kind of stucked
---------- Post added at 02:52 AM ---------- Previous post was at 02:33 AM ----------
ok, in the end managed to boot the phone with working wifi but still would like to know how to flash back to SimplyStock KK4 V1.0, just in case ;-) if that won't be problem for you. thank you !!!

IMHO the best way to go from gingerbread to ics 4.0 is to
- in the development section download stock kk4 without bootloaders, unless you dont have them http://forum.xda-developers.com/showthread.php?t=1300843
- then download a kernel of your choice probably cornkernal and put it on your internal sd card
- download ICS latest build and gapps and put them on your internal sd
- oneclick odin the stock kk4, let it boot up completely
- power off and install kernal via odin without aut reset
- boot into recovery, factory/data reset, clean cache, clear dalvik, install latest ics, then install gapps right after,
- reboot system and youre done.
IF you want to go back to your other rom the simplest way is to just kk4 fresh install, install kernal via odin, then isntall your rom.
I always keep all my contacts synced with gmail, and titanium backup any game data or app data i need, and reinstall apps through the market.
hope this helps

capocaccia said:
Yes, Froyo will still boot. If this were a layer cake it would go something like bootloader, kernel, rom. So basically, your bootloader has nothing to do with your kernel or your rom but it is at the bottom layer of the boot process. It does effect which ROMs you can use though as gingerbread and ICS roms require GB bootloaders. So flash the bootloaders, you will still be on Froyo. Update to GB. Root GB. Place the ROM on your internal SD and then flash it. If you run into any problems check the common problems page found on the first page of the SGSICS ROM.
First, if you want to keep any of your apps or contacts backup those as well using Titanium Backup. Make sure to backup to the External SD card or make a copy of the backup somewhere other than the phones internal SD.
Second, you dont have to wipe data/factory reset before you flash. This is only if you have the problem of a bootloop when you try to install. I had this problem and when I did the wipe data afterward it fixed it immediately. So follow this:
1: Boot into CWM
2: install rom
IF you have an issue with a boot loop at this point
1: Get back into CWM using the button combination
2: Wipe data/Factory Rest and Wipe Cach
Click to expand...
Click to collapse
Now can I go strait from Froyo to the ROM i listed in my OP?

okey, so at the end i decided to switch Doc's Master ICS and so far so good thank you all again for your support !!!!

mrnapolean1 said:
Now can I go strait from Froyo to the ROM i listed in my OP?
Click to expand...
Click to collapse
I gone ahead and flashed ICS onto my phone. It is working good but the Hang up button does not work. In order to hang up, i have to lock it and unlock it.
Now i did a Backup of Froyo from within CWM. if I do have a problem, can i go to DWM and restore the backed up Froyo?

Help newbie with installing new ROM

Hi, I'm stuck with installing new rom, so I hope, that you'll help me.
There are steps what I've done:
- followed THIS topic and ROOT the device with ODIN and CF-Root 4.4 file.
- OKAY, I'm rooted, so let's flash the new ROM
- entered in Clockworkmod Recovery and format EVERYTHING ( /data, /system, /cache, /sdcard etc.... just everything) for clear system
- next I load package with ROM and than INSTALLL
and here is the most important part
- when installed ROM gets something like bootloop but with restart - ROM is loading and after about 40 sec its RESTART
- and the same thing over and over again - restart ->loading->restart.... System never start up correctly to the end
- then when I saw that it does not work, I tried go into the CWM, but there was no CWM (!!!) - it was erased (by installing new ROM maybe???)
- so I must flash (old and stock) ROM via ODIN and again root device with CF-Root (with CWM) - that was only functional rom, what I was able to run, and again did this procedure
I tried this way, perhaps with millions of different ROM and EVERY was stucked (restart) while loading.
I think there are some non-deleted files in device, which should be erased (and which cannot be erased by CWM) for clear start of new installed ROM, what do you think?
Would someone please help me? I don't want old Gingerbread with Kies
Thanks for every responce!

Does it say in the thread that you have to flash a custom kernel?? Give.me the link for the thread so I can make sure that you've done everything right
Sent from ma 5assak

there is a link, but in hypertext THIS, i repost it in full text:
http://forum.xda-developers.com/showthread.php?t=788108
I think, when I've root and CWM, there is no problem and install a new rom will be very least, so not as it seems

Dude this is a kernel not a rom what's the matter with you??:what:
Sent from ma 5assak

please read all my topic - i flash this kernel only for clockworkmod recovery
through CWM I can flash any other rom
through ODIN only stock - cant find any ICS or JB rom which I can flash via ODIN (.tar file)

What variant of i9000 do you have? Are you sure that the rom you are trying to flash is made exactly for your variant?
EDIT: Try Darky ROM, they have an ODIN flashable version called "Resurrection Edition" or something.

I mean give me the link for the Rom you are using not kernel
Sent from ma 5assak

Samsung Galaxy S I9000, i'm sure 100%. NOT I9001, NOT Samsung Galaxy S2. Tried many roms from Development section for I9000, tried from get.cm etc... always the same result bootloop with restart
donhashem.dh said:
I mean give me the link for the Rom you are using not kernel
Sent from ma 5assak
Click to expand...
Click to collapse
OK. For example: this rom cm-9.0.0-galaxysmtd and cm-9-20120815-NIGHTLY-galaxysmtd from http://get.cm/?device=galaxysmtd
Or this one last ([ALPHA][ROM][4.1.1] CyanogenMod 10 for Samsung Galaxy S) http://forum.xda-developers.com/showthread.php?t=1778526 and 20120808 build.
and [ROM][PORT][ANDROID 4.1.1][BETA] TAJB: Jelly Bean port for Galaxy S V7.1 http://forum.xda-developers.com/showthread.php?t=1747042
and this too [4.0.4][ROM] Dark Knight 5.5 [27/4/2012] http://forum.xda-developers.com/showthread.php?t=1510940
and many more....
realy unhappy from this

Nikishek said:
Samsung Galaxy S I9000, i'm sure 100%t
Click to expand...
Click to collapse
I meant I9000 or I9000B or I9000M or I9000T there's a difference between them

I9000 only, checked it several times

Ok so you can flash Darky Rom Resurrection Edition through ODIN with no problem. Its GingerBread if i remember correctly, but it should give you a recovery mode and fully operating phone. From this point you can flash whatever you want.

....And there is one more important thing:
When I have a stock kernel and stock rom from Samsung, cant get into recovery mode - VOLUME UP and POWER non functional. Only when I type: "adb reboot recovery" in terminal.
Just after when I flash a new pre-rooted kernel with CWM, VOLUPE UP and POWER is now functional
k4Z3666: OK, I try and give you an echo I think, when I format everything in CWM, there will be no sign of the earlier system and ALL WILL BE CLEAR

Nikishek said:
I9000 only, checked it several times
Click to expand...
Click to collapse
ok, flashing ICS, may need to be done twice, as first flash may bootloop, IF you want to return to stock to get out of this mess, since you are not sure as to where you are now, due to flashing many roms, use any kit from My Android Collections, link below to get you to a booting ROM, than add a kernel with CWM (use EZbaze package with kernels)

that's helped me too thank you
Sent from my GT-I9000 using xda app-developers app

[Q] Help (Rooting/Brick issue)

I will try to be as detailed as possible. I have been long time user here, but this is the first time I'm posting. I usually read the instructions and posts and that usually suffices my needs. I was on a rooted galaxy note running chasmodo's assylum rom for quite some time now. For Flashing a new rom, I used to go to recovery mode, flash abbysnote kernel (v 3.9) and install a new rom. A few days ago i tried to flash Ezaechiel XXLT6 KM edition - V2.1. I guess I should have checked md5 of the downloaded rom coz after flashing it, my phone refused to boot up. It always took me to the recovery mode screen where i tried to install abyssnote kernel and reinstall assylum. but it didn't work. So I went to dr. ketan's post and tried to flash a pre rooted rom (SGN_XX_OXA_KJ1_FACTORYFS.zip) using pc odin. Now my phone works fine but i'm on ginger bread. I tried to flash new roms using recovery mode (abbyssnote kernel method) but no new rom can be installed. Everytime I try to install a new rom i face boot loop or get stuck on the setup screen. So I follow the PC odin method to flash the same pre rooted rom (SGN_XX_OXA_KJ1_FACTORYFS.zip) to get my phone working again. I would like to go back to assylumrom because i got used to aosp jellybean so much now. Anybody who has faced a similar problem in the past, please help

Use one of PhilZ kernels and then in his recovery prepare your device for a clean install (there is an option that does more than only "factory reset". With the old ones you didn't clean /preload.
Then follow the instructions to install your preferred Rom.

Thanks
ThaiDai said:
Use one of PhilZ kernels and then in his recovery prepare your device for a clean install (there is an option that does more than only "factory reset". With the old ones you didn't clean /preload.
Then follow the instructions to install your preferred Rom.
Click to expand...
Click to collapse
Thanks for the quick reply thaidai. I will try the method and get back to you I used to do a clean wipe every time.

Mate first upgrade your stock ROM to ICS or JB. The ROMs like Asylum aren't supposed to be installed in GB, so first upgrade, then root and do a full wipe (data,cache,preload,dalvik) and get back to flash the ROM. No need to flash the Abyssnote every time, why do you do that?

Varad297 said:
Mate first upgrade your stock ROM to ICS or JB. The ROMs like Asylum aren't supposed to be installed in GB, so first upgrade, then root and do a full wipe (data,cache,preload,dalvik) and get back to flash the ROM. No need to flash the Abyssnote every time, why do you do that?
Click to expand...
Click to collapse
I tried installing Cassies Xtraliterom XLC1 after the PC odin method. Got boot loop. What I'm basically saying is, after trying the PC odin method to rescue the device, I can't seem to install any other rom on it using the recovery mode route. Not even other GB roms. What am I to do??

Varad297 said:
Mate first upgrade your stock ROM to ICS or JB. The ROMs like Asylum aren't supposed to be installed in GB, so first upgrade, then root and do a full wipe (data,cache,preload,dalvik) and get back to flash the ROM. No need to flash the Abyssnote every time, why do you do that?
Click to expand...
Click to collapse
I started using abyssnote kernel to install new roms after the "brick scare" of last year after which a lot of developers started recommending the method. I used to change between GB, ICS and JB roms easily using the abyssnote kernel. Don't know why it's not working anymore.

[Q] GT-i9000, how to get old kernel & CWM back?

Hello, and first of all, sorry for being such a noob. I did try searching the forums but found nothing to match my situation.
I rooted my i9000 a while ago and installed a custom kernel with Odin. I'm not sure what that kernel was called, but it came with CWM recovery. Anyways, I then installed the newest CyanogenMod and after that the newest version as it came out. Everything was fine until I decided I wanted KitKat. I went onwards and flashed a new custom ROM, the Mackay ROM. It seems that Mackay came with it's own TWRP-based recovery and the Mackay Kernel. I tried flashing CyanogenMod 11 Nightlies with it but it just returned me to Mackay (factory reset, ofc). I've searched and searched but haven't found a noob-friendly guide on how I could get things the way they were.
So, my question here is that how could I get that old kernel and CWM back onto my phone? I haven't enjoyed using Mackay and want my CM back. My GT-i9505 is currently in repair due to a swollen battery and my trusty GT-i9000 is my daily driver right now, so I'd really appreciate the help. Thanks in advance and sorry if a thread like this already exists.

Recovery and kernel aren't always put together. Just find the recovery thread and read it's instructions. They can be flashed separately.
Sent from my HTC One using xda app-developers app

spitfire2425 said:
Recovery and kernel aren't always put together. Just find the recovery thread and read it's instructions. They can be flashed separately.
Click to expand...
Click to collapse
Thank you, but just to clarify, do you mean the TWRP or the CWM recovery thread?

Santorrr said:
.....So, my question here is that how could I get that old kernel and CWM back onto my phone?....
Click to expand...
Click to collapse
If Mackay ROM doesn't use different formatting than FAT32 or rfs (be sure of that) you can unbrick your i9000 upon my guide:
http://forum.xda-developers.com/showthread.php?t=2444308
It goes step by step from flashing a stock rom with re-partition (PIT file), root, installing cwm recovery and then you can go further with CM installation.
If you've done nandroid backup of your CM you will can restore it as soon as you flash the same rom, kernel and cwm version like when you've created it.