I am putting together a flashable zip file that will flash factory stock img files to the phone using custom recovery (CWM or TWRP). Basically flashing the zip will put all of these on your phone back to 100% original:
bootloader
boot (kernel)
radio (baseband)
recovery
system (the main OS)
This is because it will use unmodified stock img files. This is the easiest way to not lose your data in the process as well since I excluded the "userdata" partition, so all apps data and internal storage are left alone. So it's a good way to update to KitKat or going back to stock without losing your data. You can flash this package even if your bootloader is locked (as long as you have custom recovery already installed).
However, it's not full proof because you can get the error "System UIDs inconsistent", you get it when you go from a custom rom back to stock and your apps data don't match up, so you still have to clear your apps data or use "fix permissions" in custom recovery to fix this issue.
Not sure if anyone is interested in this since I guess once you know how to install custom recoveries, you probably already know how to return your device to stock easily with fastboot. And sure you can flash "
stock roms", but really they are modified and not 100% original.
Code:
assert(getprop("ro.product.device") == "mako" || getprop("ro.build.product") == "mako");
mount("ext4", "EMMC", "/dev/block/platform/msm_sdcc.1/by-name/system", "/system");
ui_print("Flashing bootloader....");
package_extract_file("bootloader-flag.txt", "/dev/block/platform/msm_sdcc.1/by-name/misc");
package_extract_file("bootloader.sbl2.img", "/dev/block/platform/msm_sdcc.1/by-name/sbl2");
package_extract_file("bootloader.sbl3.img", "/dev/block/platform/msm_sdcc.1/by-name/sbl3");
package_extract_file("bootloader.tz.img", "/dev/block/platform/msm_sdcc.1/by-name/tz");
package_extract_file("bootloader.rpm.img", "/dev/block/platform/msm_sdcc.1/by-name/rpm");
package_extract_file("bootloader.aboot.img", "/dev/block/platform/msm_sdcc.1/by-name/aboot");
package_extract_file("bootloader-flag-clear.txt", "/dev/block/platform/msm_sdcc.1/by-name/misc");
ui_print("Flashing baseband...");
package_extract_file("radio.img", "/dev/block/platform/msm_sdcc.1/by-name/modem");
ui_print("Flashing kernel...");
package_extract_file("boot.img", "/dev/block/platform/msm_sdcc.1/by-name/boot");
ui_print("Flashing recovery...");
package_extract_file("recovery.img", "/dev/block/platform/msm_sdcc.1/by-name/recovery");
ui_print("Flashing system...");
package_extract_file("system.img", "/dev/block/platform/msm_sdcc.1/by-name/system");
ui_print("Finished...");
You can reuse this script to make your own flash package if you like. It is pretty straight forward, the bootloader part is taken exactly from the OTA update packages. The command to flash other partitions are the standard way used by custom roms. I could upload the flash package barebone, but it won't be too useful for non advance users, since you still need to decrypt the system.img file (using simg2img in linux), since custom recoveries will not be able to flash it in it's original form.
If anyone is interested, I can make one package that flash all of them, or individual packages that flash each img seperately, since some might not like to lose their custom recovery or lte radio. Pretty sure something like this is available at XDA in some form.
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