Android keeps rebooting I have a ZTE v9. I flashed it with CynogenMod7 from here. I have installed ClockworkMod recovery 4.0.0.2. Then I rebooted phone from recovery. Now, the phone keeps restarting.

I can't get into recovery mode using power + volume down button (earlier I could). I have a backup of previous rom. How can I restore it?
NEVER EVER FLASH ANDROID ROM WITHOUT WIPING DATA / CACHE WIPE DALVIK CACHE
FORMAT SYSTEM (optional, but requires for some rom)

Always read instructions carefully before flashing any Rom / Mod and reverify whether its for your phone model only.

Anyway, as you said you are not able to go to Recovery mode, therefore there is no use of having a backup. Try to reset your phone, (ie, press power button for approx 7 - 10 sec). If nothing works, follow below instructions:


Take out the battery. Put on the back cover.
Hold both volume + and volume - while plug in the USB cable to a PC. It will automatically get into FTM mode.
Then flash generic 2.2 firmware on it.
After flashing, it may stuck in the FTM loop. Put in the battery and flash again.
After 2nd flashing, take out the battery for 10 seconds. Then put it back.
Press and hold both Power and Volume + to boot into Android.


I have no experience with ZTE v9, so i can't hand on step by step tutorial . Hope your phone gets well soon.

Sources:


Modaco: ZTE bricked
AndroidForums: ZTE unbrick manual