Unplug the device completely. Remove any backup batteries or capacitors. Wait 60 seconds. Plug it back in. Sometimes the device will roll back to the previous firmware version automatically.
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A: Yes, but only if you have the previous firmware file. Most manufacturers do not publish rollback files due to security and liability. Always archive the original firmware before updating. Unplug the device completely
Disclaimer: Firmware flashing carries inherent risk. Always back up existing configuration files before updating. Plug it back in
If you are updating via a serial cable (COM port), a loose ground wire or incorrect baud rate can cause bit-flipping. The device receives 0x400 instead of 0x000 and halts the update to prevent bricking.