yashsingh1/xdaforums huggingface dataset:
[Galaxy S II Q&A, Help & Troubleshooting] neerajganga:
u can have only one kernel

u cant have cm9 on secondary and siyah on primary
[Galaxy S II Q&A, Help & Troubleshooting] bjareboy:
Okey, but what if I put CM9 as my primary rom with cm9 kernel.... and if I want to go back to dual booting I just flash Siyah kernel again and my secondary rom will be there like before?
[Galaxy S II Q&A, Help & Troubleshooting] neerajganga:
well cm9 dosin support dual booting

and i don knw weather the secondary partition wud b there or no

havin tried it yet
[Galaxy S II Q&A, Help & Troubleshooting] bjareboy:
Yupp, I know cm9 doesn't support it so just wondering if it is as easy as to just flash Siyah back after testing stock CM9 kernel and everything will be like it was before... :) Have searched for an answer, but not found one..
[Galaxy S II Q&A, Help & Troubleshooting] neerajganga:
cm9 is a gud kernel for battery lyf
[Galaxy S II Q&A, Help & Troubleshooting] bjareboy:
Yupp, been hearing good things about it. Just finished my first cycle on Siyah 3.3.2 with CM9 rom and got 3,5 hours screen time and a total of 16h... not too impressed..
[Galaxy S II Q&A, Help & Troubleshooting] neerajganga:
try aokp

resurrection or rootbox
[Galaxy S II Q&A, Help & Troubleshooting] Phistachio:
Have you undervolted?
[Galaxy S II Q&A, Help & Troubleshooting] Many40:
If you set up your dual booting of two roms with Siyah, flash CM9 kernel (for testing) and flash Siyah back again - I didn't checked personnaly but think it should work. What I experienced: had dual booting and then flashed new rom as primary. After that dual booting option disappeared because hidden partition used for system of 2nd rom was overwritten by some temporary files from the new (1st) rom. But again - flashing only another kernel and then Siyah kernel, dual booting should return (however always is worth to have emergency solution - nandroid backup of 2nd rom). Regards.
[Galaxy S II Q&A, Help & Troubleshooting] Phistachio:
When I was testing CM9 kernel while I was on Siyah with dual boot, the .secondrom folder is always there, so you can use whatever kernel you want as long as you never delete that folder. Say, you try CM9 kernel. To get back to dual boot, all you have to do is flash Siyah, nothing else.
[Galaxy S II Q&A, Help & Troubleshooting] alex__sp:
Try Resurrection Remix 2.4.1(Latest version)

It has great battery life after a few cycles,getting better and better with each release.

And it's also the best ROM for GS2 IMO lots of features.

And also try setting battery as profile in advanced kernel options in recovery.

---------- Post added at 01:01 AM ---------- Previous post was at 12:52 AM ----------

Would you recommend undervolting? The last time I tried that,it crashed my S2 every time it booted.

I had to reflash to be able to go back to normal.

This was tried with RR 2.3 but it's also an AOKP based ROM.
[Galaxy S II Q&A, Help & Troubleshooting] Phistachio:
Yep, I definitely recommend a good UV but not aggressive. -50mV in CPU and 900/900/950 on GPU using 66/100/267MHz steps.
[Galaxy S II Q&A, Help & Troubleshooting] alex__sp:
Undervolting -50 mV even if I have my cpu overclocked to 1.4?

You mean undervolting -50mV in every step(CPU)?
[Galaxy S II Q&A, Help & Troubleshooting] Zoidroid:
For 1.4 undervolt to -50mV my be too low..or not. Each phone is different, you can try to undervolt, if phone freeze, reboot and try with -25. Some apps as Stability Test can help you.

Good luck!
[Galaxy S II Q&A, Help & Troubleshooting] gfamedeiros:
thank you

excelent congratulations
[Galaxy S II Q&A, Help & Troubleshooting] suprabhathalder:
I guess this would be a noob question, but any way in which I could use the apps installed in my Primary ROM on the Secondary Rom??? I have RRv2.4.1 and cMIUI 2.6.22 installed???
[Galaxy S II Q&A, Help & Troubleshooting] Many40:
The way Gokhanmoral developped his kernel is that for 1st rom apps are stored in a separated partition located in rootfs in /data folder but for 2nd rom data partition is located in /sdcards/.secondrom folder as mountable image "data.img". So, you have to install apps separately for both roms. Probably the reason for that may be that some apps can be compatible with one rom but not with the second, moreover app's settings may be different for different roms. Regards.
[Galaxy S II Q&A, Help & Troubleshooting] hybreda:
Thank you! I wish the phone had a bit more internal memory so we can actually take full advantage of dual-booting.. Memory industry needs to revolutionize fast.. so does battery industry :)
[Galaxy S II Q&A, Help & Troubleshooting] suprabhathalder:
Got it... although can't i use Titanium backup to restore some of the apps from the primary to secondary???
[Galaxy S II Q&A, Help & Troubleshooting] Many40:
Yes, you can (but you have to be sure that all apps are compatible with both roms). As default settings Titanium Backup uses /sdcard/TitaniumBackup directory to backup apps. But later on when you use apps on both roms and from time to time backup them - the last backup will be valid (doesn't matter from which rom they were made) - apps database will be overwritten by each backup. I personnally prefer to maintain separated backups for each rom to keep uniqueness of apps settings of each rom. You can set different folder in TB of 2nd rom in TB settings / Backup folder location.
[Galaxy S II Q&A, Help & Troubleshooting] Many40:
I bought recenlty 32GB microSD card, moved a lot of staff from internal SD card to external one and no problem with even dual-booting memory consumption. Of course would be nice to have more :) Regards
[Galaxy S II Q&A, Help & Troubleshooting] yanagiba:
'button battery cell' / 'backup battery' galaxy s2 get rusty because overheat ?

hi guys, i have a 'situation' :) with my galaxy s2

recently i use latest siyah 3.3.2 precisely, n use dualboot options

last week -thursday precisely- when i woke up i found that suddenly my gs2 out of power / dead and can't be turned on at all, it was strange because before i sleep it still has about 25 % on battery.

it can't be charged so i went to the samsung service centre (ssc) ask 4 the solution.

the technician said because it was rooted device so the software/custom rom was the most possible thing that cause the overheat (around 70 celcius right after booting), create rust in 'button battery cell' as anandtech name it in his review of galaxy s2 international, section 'inside the sgs2' the 11th picture

and device refusing to be charged.

but it was wrong,after back to stock firmware another day, the problem stay the same ( i start thinking that she just guessing about custom rom causing that extreme overheat).

so in my next visit to service centre she said the most possible solution is that the whole machine/pcb (pict 4 in anandtech review) should be replaced by the new one

does anyone have the same problem like this?

thx in advance
[Galaxy S II Q&A, Help & Troubleshooting] deadpunk:
Nice Guide! Will use it to dualboot ParanoidAndroid 1.5 and CyanogenMod 9.0 RC1 in a few minutes :D
[Galaxy S II Q&A, Help & Troubleshooting] pendroz:
Thanks gokhanmoral siyahkernel and DualBooT...
[Galaxy S II Q&A, Help & Troubleshooting] rehmankhan101:
Thanks alot man i was waiting for this :good:
[Galaxy S II Q&A, Help & Troubleshooting] Nathcro:
thanks a lot mate :good:
[Galaxy S II Q&A, Help & Troubleshooting] King_Rat:
Questions:

1. Can I use a nandroid as secondary rom? I'm guessing no as it was made w/ different boot/recovery etc. :confused:

2. 2.5GB is stated as needed space... yet one feedback says 5+GB was used... 5 or 2 don't really matter too much :D

Question is - How can I force phone to use my external 16GB SD card as primary? i.e. - downloads/photos/videos/backups etc. to be automatically stored to external SD, so my internal SD is just for 2nd rom

3. Once this is all setup i.e. dual boot - can I flash another dual boot kernel & maintain the 2 roms as they were before new kernel install (will they still work)?

4. Just checking here - can both roms be custom? Or, is one better off being stock?

Think that's it ^^ Mucho Gusto :cowboy:
[Galaxy S II Q&A, Help & Troubleshooting] Many40:
It seems you don't believe me :) Have you red my answer to your post here:

http://xdaforums.com/showpost.php?p=28131973&postcount=160

OK, let start again:

Ad.1 Yes, as I already answered you here:

http://xdaforums.com/showpost.php?p=28101429&postcount=158

Ad.2 Siyah kernel stores for dual-booting (when you perform "2nd rom wipe data/factory reset" from dual-boot option of CWMR) /data and /cache partitions in /sdcard/.secondrom folder in to files: data.img (2GB) and cache.img (100MB) and /system partition (in hidden partition (/dev/block/mmcblk0p9) - it is about 400 MB depending on a rom. So about 2.5 GB is right, you have to have of course small reserve. TBH when I check my nandroid backup of stock samsung rom - ti is all in all 1.21 GB.

Furthermore, you can move a lot of files from internal memory to external one as I did but this is mostly related to an option in a single app to store backups, files etc to external SD instead of internal (e.g. you have this option available in camera app for pictures and movies, in TitaniumBackup to store backups etc)

Ad.3 :confused: What do you mean. You can have only one kernel in a phone which is stored together with ramdisc in /boot partition. Siyah is only one kernel I know which can hanle 2 roms (roms share between them /boot partition)

Ad.4 They can be stock, custom whatever but must be compatible with Siyah - Siyah can work with many Stock, AOSP, AOKP etc roms. See first post of Siyah kernel for compatibilty.

I would recommend that you read also this post made by droidphille;

http://xdaforums.com/showpost.php?p=24233085&postcount=2

I belive now it's at least a little bit more clear for you. When you follow my previous 2 posts and this one you will manage to have dual-booting, it's not so difficult and not harmful for a phone.

Regards
[Galaxy S II Q&A, Help & Troubleshooting] King_Rat:
ok...

R-1: hadn't read your reply Ad.1... yet... (jeez give a guy a chance already) :victory:

R-2: Manually moving stuff sux :crying: can I swap external & internal storage?? <<= clearer question? :D

R-3: Dorimanx - supports dual boot (I know it's based on Siyah, but it ain't Siyah) :cyclops: So... again :rolleyes: if I wanted to flash a different kernel i.e. :slaps-forehead: Dorimanx :Ka-Ching: would that stuff things up? :D

R-4: tyvm :good:

PS - Just doing my research

PSS - felt these Q's weren't clearly answered in OP

PSS - stop busting my chops - plz :angel:
[Galaxy S II Q&A, Help & Troubleshooting] Many40:
Hi again,

Ad. R-2: NO

Ad. R-3: Don't know other kernels so much, but for sure there can be only one /boot partition (kernel) in a phone.

PSSS My idea was not to "bust your chops" but just to simply help you as much as I could. Fingers crossed :fingers-crossed: for your dual-booting :).

Cheers
[Galaxy S II Q&A, Help & Troubleshooting] King_Rat:
working well thanks :victory:

settled on CM9 as 2nd - Paranoid made me paranoid & blind!! RR 2.5.2 was !BAD! :confused:

thnx 4 ur guydinz
[Galaxy S II Q&A, Help & Troubleshooting] vuvuxela:
Thanks for your guide, I have flashed my first sec rom successfully.

Of course, also thanks to gokhanmoral and the great kernal.
[Galaxy S II Q&A, Help & Troubleshooting] screamworks:
Flashing an MIUI4 ROM awhile back when the dual-boot feature was introduced, but have since cleared the ROM & removed all related data. My question is, when booting the device, after the "Samsung Galaxy S II / GT-I9100" screen, there's about a two second long Siyah Kernel splash screen, which is the same one that used to come up when you were dual-booting, and it was waiting for you to choose a ROM. Only now, there's no countdown or selection, just that screen for a second or two, before my ROM boots. Any ideas on how to remove this?

screamworks.
[Galaxy S II Q&A, Help & Troubleshooting] Many40:
If I understood you correctly ... You removed your second rom and you have to wait longer than normal on Siyah kernel logo even dual-boot option is not shown ? If yes, it's starnege and have never faced this. Alway when I remove second rom, the first one boots afterwords quick - without waiting. Only thing whi come to my mind is - how did you removed 2nd rom. Did you use "Remove 2nd rom" option from CWM recovery / "dual-boot options". If not try. Regards

Edit: BTW there is possibility to not display Siyah bootlogo at startup if you don't like it - just create a empty file: "/sdcard/.nobootlogo". If this file exists no boot logo will be displayed.
[Galaxy S II Q&A, Help & Troubleshooting] yanagiba:
'button battery cell' / 'backup battery' gs2 dualboot get rusty because overheat ?

many40, would you mind to give some advise for my problem here

thanks alot
[Galaxy S II Q&A, Help & Troubleshooting] Many40:
TBH I red your post before, but as I am usual user of i9100 as you are (maybe a little bit more experienced) I try helping others as much I can, sharing my experience. Unfortunately my experience doesn't contain such problem like that. I've never heard about this kinda behaviour of a phone and think it's not a kernel nor dual-booting related, especially that you said you flashed stock rom and the problem appeared again.

But, starting from the beginning, what is your current phone status because I am not sure if unerstood you correctly:

1. Are you able to use/boot the phone or it's "dead"?.

2. If yes, what firmware do you have?
[Galaxy S II Q&A, Help & Troubleshooting] johnhany97:
Hey, Thanks for the AWESOME work with your kernel, I use it with any ROM i put on my mobile :D

I just wondered why some ROMs (though rooted) don't show that. (Meaning that when I open any app that requires root it doesn't see the root installed though I am 100% sure it is), So this problem is with the 2nd Rom or because the ROM might have the problem in it??? (This happened with MIUI and Salmon ICS):confused:
[Galaxy S II Q&A, Help & Troubleshooting] Many40:
I used many roms as 2nd and never had problems with root after used this feature of Siyah kernel - in ExTweaks app / "Misc", check "Auto install root", then "Remove root" then reboot. So kernel reinstals root for 2nd rom in case any problems. Afterwords "Auto install root" can be unticked.

BTW this thread wasn't started by dev of the kernel - Gokhanmoral - I am sure that he appreciates your thanks but he will rather have no oportunity to read this.

Regards
[Galaxy S II Q&A, Help & Troubleshooting] yanagiba:
thanks for your reply mate.

in fact I've written in detail, why my gs2 dead

and previously I have tried to make a thread about my problem

but i can't, apparently for two reasons, first because of my post is still very, very few and maybe too long a description in one post.

Now back to the question

1.since last week, I just keep my phone in a box in the drawer.

it still can be turned on as usual, the problem is even when the battery just in pairs, within 2-3 minutes the side of the battery so quickly warm then hot by itself, but note that it is not turned on yet.

and when it is turned on, just in 1-2 minutes the temperature rises dramatically to 70-80 degrees Celsius. I saw it on 'batstat widget'.

2. my gs2 last condition before i got the problem is for 1st rom criskelo v11.2 and 2nd rom resurrection remix V2.4 with siyah 3.3.2.

after that I could return it to the stock firmware dxki2 GB 2.3.4 official for indonesia from sammobile.

do you mind and is it okay if i put my detailed story in my next post to explain the problem completely?

thx
[Galaxy S II Q&A, Help & Troubleshooting] Many40:
I think it's ok but I'm sceptical if it's proper thread for your issue from two reasons:

1. Your case is rather not dual-boot related but general phone/batter one.

2. There are threads which more experienced guys visit than this one for example:

http://xdaforums.com/showthread.php?t=1658647

related to Siyah kernel in general.

If you don't find better suitable thread to post your problem I would advice you to post not here but on the thread above. Regards.
[Galaxy S II Q&A, Help & Troubleshooting] yanagiba:
ok. i will post my problem there.

thanks alot for your help mate, i think we will meet again there don't we.
[Galaxy S II Q&A, Help & Troubleshooting] Many40:
Yes of course mate. BTW our flags are very similar :)
[Galaxy S II Q&A, Help & Troubleshooting] johnhany97:
Thanks :)

Ok, thanks for your reply. (btw it worked !!!)
[Galaxy S II Q&A, Help & Troubleshooting] Many40:
You are welcome (btw do you agree with the first sentence from my signature? :))
[Galaxy S II Q&A, Help & Troubleshooting] Angabow:
SG2 dual booting - 2rom no internet access

Thanks for this informative tutorial post

am a noob though i dual booted my SG2 But:

i installed two roms – dualbooting sg2, siyah kernel latest, modem xxlps, ics 4.0.4 official leaked as primary rom and tried many other ics roms as secondary rom, every thing went fine, but the only problem is that , the secondary rom has no internet access?

please any who can find the Fix?:crying:
[Galaxy S II Q&A, Help & Troubleshooting] Many40:
Based on posts from original thread of Siyah kernel current version is not 100% compatible with new 4.0.4 stock ics:

http://xdaforums.com/showthread.php?p=28316197

http://xdaforums.com/showthread.php?p=28324460

Press "Thank" button if contributed to your solution.
[Galaxy S II Q&A, Help & Troubleshooting] yanagiba:
yes, you're right:)
[Galaxy S II Q&A, Help & Troubleshooting] snappy123:
can u install 2nd rom with odin??

or

can i swap clone my primary to secondary

then use odin to install another rom over the primary
[Galaxy S II Q&A, Help & Troubleshooting] neerajganga:
no u cannot flash 2nd rom via odin

if u want to dual boot stock rom with any other rom

then first flash stock rom in odin then flash siyah and then u can install a second rom via recovery ..

if u want ur stock rom as secondary u can swap it
[Galaxy S II Q&A, Help & Troubleshooting] snappy123:
hey i figured it out but thanks anyway
[Galaxy S II Q&A, Help & Troubleshooting] nefem:
Creating 2ndROm data for first time.

This will take long.

E: format_volume: make_extf4fs failed on /mnt/.secondrom/.secondrom/cache.img

Error formatting 2ndROM data

What`s the problem?
[Galaxy S II Q&A, Help & Troubleshooting] Many40:
These I believe are results displayed on the screen. Can you describe firstly steps you followed to finally receive what you reported? Is it result of Wipe 2nd rom data/cache? or maybe you did something else?

Press "Thank" button if contributed to your solution.
[Galaxy S II Q&A, Help & Troubleshooting] auto_freak:
about to dual boot two roms today, this guide has been helpful so far. :good:
[Galaxy S II Q&A, Help & Troubleshooting] eezymoney:
I have the latest Siyah Kernel for the S3 and clockworkmod touch recovery 5.8.4.5 but no dual boot options menu?
[Galaxy S II Q&A, Help & Troubleshooting] Phistachio:
Dual boot isn't in S3 yet.
[Galaxy S II Q&A, Help & Troubleshooting] neerajganga:
This is for s2

dual boot is not yet available for s3
[Galaxy S II Q&A, Help & Troubleshooting] TheIceKing:
Thank you for this guide. Very clear! I'm gonna try it out and will post the result :D
[Galaxy S II Q&A, Help & Troubleshooting] Many40:
Belive me, results can be only positive :)
[Galaxy S II Q&A, Help & Troubleshooting] billdsl:
Now i apologise in advance for this nub question. I have searched like crap for an answer.

I want to dual boot CM9 + stock rom.

I installed Siyah last night and from the PC the only option to access the phone is with ADB.

I dont want ADB and want access through explorer, but for the life of me cannot find any way to uninstall ADB, or disable it, or continue to access the phone through explorer with the ADB connection in place.

Any advice or guides I can read up on this, or is my setup just playing silly buggers?
[Galaxy S II Q&A, Help & Troubleshooting] bucegiomu:
Stuck in the rom animation screen after booting rom2

Hi I have dual boot in my SGS2 using syiah kernel 3.3.3c with rom 1 being stock rooted and rom 2 being Resurrection remix. For a while I was very happy and I could load one ROM or the other. Suddenly I could not load the second rom anymore: after chooseing the second rom, it gets stuck in the rom's boot animation screen. Then I restored the second rom from a nand backup and i could boot that rom, but I could not boot anymore the first rom: gets stuck in the rom's boot animation! I swapped the roms and I cannot boot anymore the first rom (which was before the second rom) with the same problem: gets stuck in the rom's boot animation. Between all these steps I also tried wiping the cache partition and the dalvik cache and fixing permissions, but it did not help. Now no matter if I choose the first or second rom, it get's stuck in the respective rom's boot animation. Please help!
[Galaxy S II Q&A, Help & Troubleshooting] cdaarif:
Plz can u give/pm me the link of kernel cleaning script for i9100
[Galaxy S II Q&A, Help & Troubleshooting] Many40:
Here is the link to Ultimate Kernel Cleaning Script thread. Belive that you will not have problems to download it from there:

http://xdaforums.com/showthread.php?t=1363738

Regards
[Galaxy S II Q&A, Help & Troubleshooting] cdaarif:
10Q so much. Now im trying to duel booting :)
[Galaxy S II Q&A, Help & Troubleshooting] conanb3t:
Can perform following this guide for GB ROM?
[Galaxy S II Q&A, Help & Troubleshooting] olrait:
I believe you can't dual boot GB and ICS. Not sure if that was yor question.
[Galaxy S II Q&A, Help & Troubleshooting] Many40:
No.

You are right.

Here is an explanation from droidphile's thread:

"15) "Can i have one GB rom and second ICS rom?"

A. No

16) "Why?"

A. Kernel partition is shared between roms. Dual boot functionality is implemented in ICS kernel. ICS kernel can run only ICS roms."
[Galaxy S II Q&A, Help & Troubleshooting] jerseykat1:
I often try the nightlies for cm9, if i dual boot with the siyah kernal, will i end up wiping out the second ROM when i flash the newest CM9 nightly ROM?

I would like to install a second stock like (any suggestions on which one) rom only for the purpose of using my mhl adapter to play content from my phone on a TV, and currently CM9 does not have mhl working.
[Galaxy S II Q&A, Help & Troubleshooting] timberwolf60:
You need ample space, used cwm version like wanan rom and fellow the instructions on the first page. Any how always do a nandroid backup first.

Send from my GT I9100 using Tapatalk2, 1st ROM Paranoid V1.6a, and 2nd ROM XXLPW, Siyah 3.3.3d kernel, jkay 14.1 mode.
[Galaxy S II Q&A, Help & Troubleshooting] billdsl:
Any chance on some assistance on this?
[Galaxy S II Q&A, Help & Troubleshooting] timberwolf60:
Because you never clearly mention what rom you have and which siyah kernel you used.

Since you have a system and installed siyah kernel already. Boot your phone into cwm recovery and just fellow instructions in the first post. If you were on cm9 rom with siyah 3.3.3d. Then boot into cwm recovery you will see a dual boot option, just fellow instructions from first post. But the stock rom must be customer rom and be abled flashed through cwm like wanan rom. Nandroid backup your existing rom first then proceed to flashing second rom.

Send from my GT I9100 using Tapatalk2, 1st ROM Paranoid V1.6a, and 2nd ROM XXLPW, Siyah 3.3.3d kernel, jkay 14.1 mode.
[Galaxy S II Q&A, Help & Troubleshooting] olrait:
You can always backup your phone, install via odin the stock rom you want, root, flash siyah, install your custom rom as secondary rom and finally swap them if desired.
[Galaxy S II Q&A, Help & Troubleshooting] billdsl:
Thanks for the response, but its not the dual booting setup Im having issues with, Im happy to work through that following the guide. What I really am having issues with is that i want to still be able to copy files to the phone through windows explorer, but when the Siyah Kernel is installed it comes loaded with ADB and the PC hooks up to it through that setup rather than normal USB.

I just want to know if you are supposed to be able to connect to the PC with both USB & ADB or it will only go through ADB once its installed?

That make sense?