- In the recovery menu, select Backup/Restore, then select Nand backup. What this will do is backup your current ROM on your SD card, if something goes wrong while flashing the new ROM you can simply boot into recovery and restore your previous ROM. Custom recovery menu will look like this:
# mount -o remount,rw -t yaffs2 /dev/block/mtdblock1 /system # cat /sdcard/flash_image > /system/bin/flash_image # chmod 755 /system/bin/flash_image # mv /system/etc/install-recovery.sh /system/etc/install-recovery.sh.bak # mount -o remount,ro -t yaffs2 /dev/block/mtdblock1 /system # flash_image recovery /sdcard/recovery-RA-GNM-thunderg-1.1.0.img # reboot recovery The command highlighted in red will show error in some phones. Just Ignore it. Its normal. After successfully executing all the commands your phone will boot into Custom Recovery mode because the last command was “reboot recovery”. To boot your Phone into Custom Recovery mode anytime, switch off your phone and press and hold the vol_down + home + power buttons.
If you have any questions, feel free to ask and leave it as a comment. Visit my blog to see the inside of Cyanogenmod ROM.