The A133 includes ARM TrustZone. Many firmware images include (Open Portable TEE). If your device has secure boot enabled, unsigned firmware will fail to boot. In that case, you need:
: Allocating space for the boot, recovery, and system images. If the recovery mode is not working, it often indicates a corrupted partition or an incompatible firmware version. allwinner+a133+firmware+work
sunxi-fel version
On tablets and devices using the Allwinner A133, this feature functions as part of the Android Enterprise Work Profile Profile Isolation The A133 includes ARM TrustZone
Would you like this expanded into a full README, a step-by-step flashing guide, or a detailed device-tree draft? a step-by-step flashing guide