You need to set up a file called "mtdpartmap.txt" must be located in the root of the /sdcard directory and which contains the following line:
mtd 145 2
Then reboot into recovery and flash Firerat's fr_recovery-xxx.zip, reboot into recovery and use Ohsakas Superwipe or reboot into fastboot mode and enter
fastboot erase system -w
Now reboot into recovery again and you have the new partition map installed.