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ASUS Transformer Prime hard reset TF300T

Turn off Prime. Press and hold the Volume Down and Power buttons until you see message. Press the Vol UP button in less then 5 seconds. In recovery menu select wipe data Factory reset. Then restart/reboot tablet.

Soft reset ASUS Prime if frozen
Press the reset button to restart ASUS Prime.

Reset Button
If the system becomes unresponsive, press the reset button to force
the Eee Pad to restart.
Forcing the system to restart may result in data loss. Please
inspect your data to ensure there is no data loss. We strongly
recommend that important data be backed up regularly.

Eee Pad Transformer Prime TF201 Firmware: V9.4.2.7 Only for WW SKU (Android 4.0.3)

Warning ! Sku WW number must be the same! Download firmware from ASUS website.
Check Build number:
Select Settings-->About tablet-->Build number

General advice: Before you buy a new cell phone or new tablet, please try the following procedure to repair your device in a software way. First charge your battery, backup your important data if possible and in most cases take out SIM and SD card before doing factory reset. It is impossible to recover your data after doing a hard reset, so online backup is always important. For all of your data, a backup should be done on an external device, hard drive, raid system or media. With or without insurance, if your cell phone lost, damaged or stolen at least your invaluable data is backed up in a safe place. If you are about to sell your phone and you want to wipe your personal data, or if your phone affected with virus you have to do a hard reset. In some cases, you can delete the forgotten password or lock pattern from your device as well. All information is for devices with stock based ROMs. If you are using rooted device, always back up your EFS folder first, containing your IMEI info, etc.! Please also note, that a hard reset operation will not unlock your mobile phone's SIM lock or network lock, but it will remove the unlock pattern, remove the user password or PIN password (NOT the SIM card's 4 digit PIN code). Also note that the firmware version will not be affected in any way, it will not be downgraded, it will remain the same you are using and if you have rooted your device, root privileges remain also unaffected.