greetings all,

please help if anybody had a similar experience before.
i used flip 3.4.1 to successfully read firmware from at89c51rc2
to do so i used "hardware force it in to bootloader" mode (PSEN to ground through 1k on reset edge fall and EA tied high through 5k)
than i read the memory from 0 to 0x7fff and it seemed fine.
the security byte was 0xff, BSB was 0xff and SBV was 0xff also BLJB was not selected.
i switched the power supply of the controller and placed it back in to the device i took it from, now in the device it is not booting for some reason.
i can force it back in to the bootloader mode and read the same memory content, i can manipulate bsb, bsv and bljb.. but whatever i do i cant force it to work in the device.
anybody has a clue what might've happened?

many thanks!