Hello i have Geller SX580 and shows key op error .how disolve this problem?

Hello i have Geller SX580 and shows key op error .how disolve this problem. Is not working any function.
Megan, January 2021
Did that RESOLVE the problem?

HTH, January 2021
http://www.eposwizard.co.uk/towa-sx-580-half-reset-t2427.html

And

https://www.manualslib.com/manual/966081/Geller-Sx-585.html

HTH, January 2021
link Click here to see other fixes for Geller.