UP300 latest screen firmware major issue

Since updating the screen firmware from 1.5.7H to 1.5.17 yesterday, there are some major problems. :frowning:
normally, upon starting a print, it does a nozzle purge in a line across the table somewhere close to the print
Since the firmware update, it plunges straight down to the table, rapids around to 2 or 3 random positions then starts printing, about 2 minutes later, THEN it does the nozzle purge line.
Is there a way to revert back to the previous version? I cannot find a link to previous versions anywhere.

Only installed this latest version to hopefully to fix a recurring error: β€œerror getting printer results timeout (CTRL) (3103.3103.3103.2.2)”

The latest firmware unfortunately did not fix the problem

Please help