[w810] oldest firmware

someone could tell me what is the oldest version of firmware?
Should I downgrade it without problems?

now I got R4EA031

thanks

no need to downgrade, newer version, better bug fixes as far as i know

I wish to downgrade because I read somewhere that first fw had, under the display menu, the choise "sleep mode clock" on or off. that's all.

Do you know what is the oldest?