Firmware update fail. Help

[Cabeza960]

Hello, years ago I bought a RDS Pira 32 encoder (version without battery) that works until today. After several years without using it I tried without result to update the firmware to version 1.6 since it has version 1.4 . I used the "fwup" updater and did the procedure, led 1 lights up but after a few moments the message "update failed at 300 bytes. Connection lost. Try again". How can I perform the update correctly?

[Jan]

We've stopped producing such model maybe 18 years ago, at that time the firmware version was 1.2.
Anyway, it still accepts latest firmware. The unit uses old RS-232 interface so check the cable wiring or try another USB to RS-232 adapter or another PC.
Click on the Start! button and then connect power to the RDS encoder.