can not re-flash firmware after ram off

Question

hi Nordic support team,

I cannot re-flash firmware for nrf52840 after ram off is implemented.

I recheck with other chip like nrf52833, it have the same result: \althrough it can connect to chip but can not re-flash firmware.

Do you have suggestion for re-program chip

This is my code:

void RAM_off( void )
{
#ifdef NRF51
    NRF_POWER->RAMON |= (POWER_RAMON_OFFRAM0_RAM0Off << POWER_RAMON_OFFRAM0_Pos) |
                        (POWER_RAMON_OFFRAM1_RAM1Off << POWER_RAMON_OFFRAM1_Pos);
#endif //NRF51
#ifdef NRF52
    NRF_POWER->RAM[0].POWERCLR = POWER_RAM_POWER_S0POWER_Msk | POWER_RAM_POWER_S1POWER_Msk;
    NRF_POWER->RAM[1].POWERCLR = POWER_RAM_POWER_S0POWER_Msk | POWER_RAM_POWER_S1POWER_Msk;
    NRF_POWER->RAM[2].POWERCLR = POWER_RAM_POWER_S0POWER_Msk | POWER_RAM_POWER_S1POWER_Msk;
    NRF_POWER->RAM[3].POWERCLR = POWER_RAM_POWER_S0POWER_Msk | POWER_RAM_POWER_S1POWER_Msk;
    NRF_POWER->RAM[4].POWERCLR = POWER_RAM_POWER_S0POWER_Msk | POWER_RAM_POWER_S1POWER_Msk;
    NRF_POWER->RAM[5].POWERCLR = POWER_RAM_POWER_S0POWER_Msk | POWER_RAM_POWER_S1POWER_Msk;
    NRF_POWER->RAM[6].POWERCLR = POWER_RAM_POWER_S0POWER_Msk | POWER_RAM_POWER_S1POWER_Msk;
    NRF_POWER->RAM[7].POWERCLR = POWER_RAM_POWER_S0POWER_Msk | POWER_RAM_POWER_S1POWER_Msk;
#endif //NRF52
}


int main(void)
{
    ret_code_t err_code;
    uint8_t len = 0;
    RAM_off();

    while (true)
    {
       
    }

}

Quangca · Accepted Answer

Hello i can fix this. 
 Step like this for anyone have same issue: 
 1. using cmd jum to folder has .hex ex: ...\pca10040\blank\ses\Output\Rel 
 2. Earse chip using ciommand: nrfjprog -f NRF52 -e 
 3. Reprogram with another firmware Ram on with command line ex: nrfjprog --program name_file.hex --chiperase --reset 
 
 Done!!

can not re-flash firmware after ram off

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