Click on the Firmware tab in PhoenixSuit, click Image , and select your downloaded Allwinner A133 .img firmware file. Enter FEL (Flashing) Mode: Power off your A133 device completely.
Unlike UEFI or BIOS, the A133 starts executing code from a embedded in the silicon. This ROM is immutable and contains the "Boot0" logic. Its sequence is critical: Allwinner A133 Firmware
The flashing progress bar will begin moving. Click on the Firmware tab in PhoenixSuit, click
The computer cannot flash the device while it is running normal Android. You must force the A133 chip into FEL mode. Power off your A133 device completely. This ROM is immutable and contains the "Boot0" logic
Follow these steps carefully to flash a stock or custom .img firmware file onto your Allwinner A133 device using PhoenixSuit. Step 1: Prepare the Software Download and extract on your PC. Launch PhoenixSuit.exe as an Administrator. Click on the Firmware tab at the top of the interface.
If you can tell me the (usually found on the back) and the PCB number (if you've opened it), I can help you narrow down the search for the correct firmware . Allwinner A133 Android Device Security Research - GitHub
Once you have downloaded the correct .img firmware file and installed the drivers, follow this standard flashing procedure.