Firmware update problem – urgent

i’m not sure which firmware was on the device!

(before starting update) This was what i remember when looking at the System Details menu
2016 (is this one the date or firmware version?)
1543 (i think the nr. here was something like this or close)
169.254.145.18 (IP Address)

After following all steps, having uTrack24 connected to the network router, and finding the IP with Fing app, i was able to open html drag and drop network firmware updater where i dropped the latest version 3474 (progress bar works both at the uTrack and computer) Resulting in a message at html saying
Error writing flash memory,
and a message at uTrack24 saying
system error power cycle dev. and try again

What should i do now?

Thanks!