Thank you for your help Neil.

Hi Neil,
It is Winbond W25Q64FV soic 8
The "device start" address i'm using is 0 and "device end" address is 00003003FF
I've tried that option and indeed is reprogramming fine between the "device start" and "device end" but apparently everything after "Device end address" it is erased.
In the ...

In the easiest way is fine but the the manufacturer does not agree to touch a portion of the bios so i have to go for the other way.
In the other way, i can write part of it but the rest is erased.

I have a Dataman-48PRO2C.

I need to write (re-write) a 8M laptop bios eeprom between specific addresses, as an example, between 0 and 6002ff and the rest of the addresses up to 8002ff to be left unchanged. (i have a full dump file from good working chip but i don't need to erase/over-write the full eeprom)
Is there any ...