Aot4221sr Firmware Upgrade -
Q: Do I lose my calibration data after an aot4221sr firmware upgrade?
A: No, provided you do not erase sector 0x0801E000-0x08020000. The aotflash_cli tool preserves this by default unless you use --full-erase.
Q: Can I downgrade the firmware?
A: Yes, but only if the bootloader version is compatible. Downgrading from v2.2.x to v1.9.x will trigger a factory reset of configuration parameters.
Q: How long does the upgrade take?
A: Over UART at 921600 baud, approximately 45 seconds. Over OTA with a 100 Mbps link, about 2 minutes. aot4221sr firmware upgrade
Q: The device is not responding after upgrade—LED shows rapid amber. What now?
A: This indicates a boot watchdog timeout. The upgrade likely corrupted the interrupt vector table. Perform a full chip erase (see Section 6) and reprogram.
This method works on 99% of AOT4221SR deployments, including those without network connectivity. Q: Do I lose my calibration data after
While I can guide you through a general process, it's essential to consult the device's manual or the manufacturer's website for model-specific instructions.
Upgrade the Firmware: Execute the firmware upgrade according to the manufacturer's instructions. This process might vary significantly depending on the device. Upgrade the Firmware : Execute the firmware upgrade
Verify the Upgrade: After the upgrade is complete, check the device's firmware version again to ensure it has been updated successfully.
Before initiating the upgrade, the correct physical interface must be identified. The AOT4221SR typically supports one of two programming methods:
