[MOD][JB][I8160+P] 624 MB accessible RAM on ANY Jelly Bean ROM

CHANGES:

FOR I8160:

- included new Jelly Bean Secondary Bootloader (SBL) now MC8 (and possible other) builds are supported

FOR I8160P:

- included new Jelly Bean Secondary Bootloader (SBL), and param.lfs from P ROM.


INFO:

This small mod will give you 624 MB accessible RAM on (almost) any stock JB firmware, without installing any other ROM by flashing a new Secondary Bootloader and PARAM.
These files are from the Russian XXMG2 ROM and XXME1 (P) ROM - flashing them does not increase the flash counter.


FLASHING INSTRUCTIONS:


I8160: So far only MC8 requires V2, other builds (MF1/MF2/MG2) should work with V1!
I8160P: I don't have it, try V1 first then V2.
I8160L/Chinese/Hong Kong variants: don't try V2, only V1 (not the _P_ version) !


IF YOU ALREADY HAVE JB (and with 482 MB or 550 MB RAM):

1, Flash your stock firmware with Odin, or Update with Kies - assuming you already did.
2, Download the attached 624MEM_V1 or V2.rar.
3, Restart your phone in download mode, start Odin and select 624MEM_VX.tar.md5 as PDA.
4, Flash it, after restart your phone should have 624 MB RAM accessible.
- If the phone boots to recovery just select "reboot system now" and press the power button.






FLASHING STOCK ROM WITH THIS MOD:

1, Download the attached 624MEM_V1 or V2.rar, then extract somewhere.
- Select the stock ROM as PDA and 624MEM_VX.tar.md5 as CSC.
- DO NOT TICK REPARTITION
2, Flash it.
3, After restart your phone should have 624 MB RAM accessible.




CWM FLASHABLE ZIP (ONLY FROM V1):

- I decided to make CWM version only from V1 because V2 replaces the bootloader, and that is much safer to do with Odin.
- requires rooted phone (JB) with busybox and CWM recovery

1, Copy 624MEM_CWM.zip to your external SD card.
2, Flash with CWM as update.zip.
3, After restart you should have 624 MB RAM accessible.


To remove this mod, follow the "HOW TO COME BACK TO GB" guide and after that reflash your stock JB firmware without this mod.

It will replace kernel2.bin.md5 and param.lfs.md5.
Probably param.lfs.md5 causes the RAM change, but I also included kernel2.bin.md5 because these 2 files are present in every rom with 624 MB RAM.
Both files are from Russian SER (XXMG2) firmware without any modification, so it will not increase the flash counter.

Sorry, I forgot that .md5 files are not supported by the site.
Thread updated, 624MEM.tar.md5 attached in rar format.

Edit: Update.zip version for CWM added.

If you take your phone to a Samsung repair center and they update it with their "full" firmware you'll have 624 MB RAM, there is a problem with some Kies firmwares, that's why many phones after official update will have 482 or 550 MB.
This method adds the "missing" files so you'll have 624 MB RAM without flashing another rom.
And yes more RAM will give some performance improvement.

MC8 was better with 550 MB, but newer MF1 and MG2 builds are much faster with 624 MB RAM.

Well, I tried MC8 and was better with 550, BUT when MC8 released to get 624 MB RAM we had to flash MB2 or MB4 leak - and that could be the cause of the bad performance.
I suggest you to try it and later you can reflash to GB then JB if you are not satisfied with the performance.
Currently the mod does not working on MC8, because all MC8 builds are without the new JB bootloader.
I will upload a new version in a few hours.

Edit: New version added, now MC8 builds are supported.