P3 Bootloader Update Process for Bootloader v3.3 - AT89 ONLY ! ============================================================== To work around a bug in the ATMEL AT89C51ED2, the P3 bootloader must be updated with a new version. Without this fix, updating P3 main program may result in CPU configuration corruption and boot failure. To apply the fix, follow this procedure: 1. Enter Firmware update mode (hold FUNC+PAGE at power up) 2. Press F3 - Flash 3. Transmit p3-bootloader-v3.3-AT.syx (or .MID file version) to P3 When transfer is complete, display should show: size0C00 chk8631 boot flash 4. Press F1 - boot Display should show: P3 - Boot update F2 to start 5. Press F2 Display should show programming progress, followed by: DONE - reboot and reload image 6. Turn P3 off then on 7. P3 will report checksum error. Press F3 - Flash 8. Transmit P3 main program 9. Restart as normal Note: You can confirm the installed bootloader version by holding FUNC+PAGE at power on. Display will show: v3.3 Chk = xxxx boot flash indicating current (v3.3) bootloader. Previous versions will show: v3.2 Chk = xxxx boot flash Or Checksum = xxxx boot flash and should be updated.