Sam 4s model?

https://www.fixya.com/support/t27316427-sam4s_e5215_warning_plu_no_data

Also see some of the replies here:

https://www.howtomendit.com/answers.php?id=295607

Manual here:

http://www.cashregisterhelp.com/files/Samsung_5215M.pdf

When you do the reprogram, make a readable record of exactly which settings you make. That way it'll be a simpler walkthrough if you lose the programming again.

If you can make an electronic backup, even better. So lomg as you make certain you can actually restore from the backup and keep two copies, one onsite, the other off-site

3nrh
August 2022