[AT&T Samsung Galaxy S II SGH-I777] ktoonsez:
4.1beta5 Change Log

■Fix permissions issue causing crashing on bott with certain Sammy ROM's

4.1beta4 Change Log

■Linux 3.0.40

■CWM-Based Touch Recovery v6.0.1.1

■fixed led timeout not being saved

■new GPU frequency steps: 54, 108, 133, 160, 266, 330, 400, 440, 520MHz (Removed in beta4)

■added one more GPU step, we now have 4 GPU steps with 108, 160, 266, 330MHz defaults. (Removed in beta4)

■added ntt docomo gps support again (ntt-docomo users can use their previous scripts to get gps working)

■fixed movfilter not being changed with kmemhelper (should fix touch sensitivity problems)

■removed 25MHz and 50MHz CPU steps

■fixed led activity on brightness change

■ExTweaks settings will be reset because of GPU changes. if you revert back to a previous version make sure you reset ExTweaks settings manually.

■update beta1 -> beta4: fixed gamma shift not working in ExTweaks. removed all gpu modifications to make sure we have no problems with other parts. some users (including me) experienced no problems with new gpu steps whereas some users had kernel panics when the screen is off. Consider v4.1beta4 as 4.0.2 with linux 3.0.40 and cwm-based recovery 6.0.1.1.

3.5 Change Log

■bluetooth: support for 4.0.4 stock ROMs

■Whole butt load of merges from Tungstwenty

3.4.4 Change Log

■pegasusq fixes and tweaks

■added cfs tweaks settings to ExTweaks (samsung default, linux kernel default and thunderbolt script defaults)

■added Tungstwenty’s implementation that let’s us see deleted wakelock details (optional in ExTweaks)

■cherry-picked some wifi changes/fixes from cm9 repo

■added mdnie negative effect toggle to ExTweaks (by Tungstwenty)

■and some other tiny changes…

■Linux 3.0.36

■removed some potentially unsafe changes which might be the reason of some users having problems with the latest release.

■added ntt device gps support back. removed exfat related mess. added Entropy512′s patch to prevent multicast packets for added headphone amplification setting to extweaks (named it soundgasm). fixed data statistics and some other changes in config and sources…

3.4.3 Change Log

■Linux 3.0.36

■Several USB fixes

■NFSv4 issues addressed

■Fix overlapping static i/o mappings

3.4.2 Change Log

■Linux 3.0.35

Dual-Boot instructions and Notes

If you want to have another ROM as secondary ROM, follow these steps:

1.Make a nandroid backup of your existing ROM

2.wipe everything and install the other ROM

3.Boot the ROM and make customizations. Don’t forget to reflash SiyahKernel if the ROM flashes another kernel.

4.Use CWM Touch Recovery to clone your rom as secondary rom.

5.Restore nandroid backup

6.To boot from the secondary ROM, either press the HOME key or the VOLUME DOWN key when prompted.

Some notes about dualbooting:

■If you do not make any cloning you won’t be prompted to boot the second ROM.

■you may need to reflash this kernel after a nandroid restore if your nandroid backup is created with another kernel.

■you won’t be able to use mass storage mode for /sdcard in second rom because we have our data and cache partitions on /sdcard. only external sdcard will be mounted if you are using mass_storage mode. mtp should work fine for sdcard.

■once again, you won’t be able to flash any CWM flashable zip to second ROM.

More good information on dual-boot

http://xdaforums.com/showpost.php?p=24724563&postcount=3296