[dil6222]

Hello all this should help users who have locked atmega64 on xprog and can not read or program chip anymore. 100% way of unlocking after hours/weeks of research and testing.

This is done off board with qfp64 breakout board should be able to  program onboard xprog also though.


easy fix all you need is:

1. UPA PROGRAMMER 

2. USBASP WITH SLOW CLOCK JUMPER ON  
     EXTREME BURNER SOFTWARE AND 10 TO 6PIN ADAPTER 

3. JUMPER WIRES FEMALE AND MALE

4.QFP64 BREAKOUT BOARD 

let's get started

 1.     First of all connect jumper wires between atmega and usbasp
       you will need to split vcc + into 3 wires and gnd - into 3 wires 

Connect vcc+ to pin 21,52 and (64 i believe optional as for avcc i test later) 

Connect gnd- to pin 22,53 and 63 

Connect SCK to SCK

Connect RESET to RESET

MOSI to PE0    (common problem is people using PB2 and PB3 as there listed as mosi and MISO but they are not )

MISO to PE1 

You should end up with something like this you can see I've split the and vcc 

   


2.   Next connect PIN2  from UPA DB9 SOCKET to XTAL 1.

Now connect everything else usbasp and upa to usb etc 

   

Now comes the fun bit 

3.   Open upa go on tools then pulse generator and you will see this:

   

Change frequency to 1000khz and click start and leave it running.

   

 4. Open extreme burner avr and go to fuse settings tab and click on read 
        atmega should connect as normal

   

5. Go on each set of fuses low, high, extended lock go on bit details and click load default value for each set
   Then tick all the write boxs and click write.   or you can manually enter the following  
(  Low E1,  HIGH 99, EXTENDED FD, LOCK FF then click write these are factory lockbits. see photo

   

6. Go on low fuses and check the following clksel settings are  there

Cksel0   (1)
Cksel1   (0)
Cksel2   (0)
Cksel3   (0)

   

Now erase chip and then disconnect upa 

That's it all done it should be able to program/ read as normal without upa sending signal to xtal1 on mega.


 Hope this helps many  CT members to unlock atmega 64 so it can be reused not tossed into the bin 

I've spent many hours tearing out my hair to bring this guide so PLEASE leave thanks and rep if it helps 

Many thanks dil6222

[spanaz1]

Good work M8, I know you've spent months on this, most people would have given up like I did, and thumbs to share this for free...

[cubica]

Nice work !!! Congratulations!
Is there a way to read content from locked Atmega,,,32, 64..I need to read locked content from white goods MCUs.

Thanks for nice post,
regards,
cuby

[zmann]

An alternative, if someone found the above setup is hard in practical or hard to reach by you. Another well known fix that frequently used among those AVR enthusiasts is external clock source by an oscillator.

You could find such oscillator unit from an old board, any frequency of no more than 10 MHz should be fine but you could success with one of higher frequency as I did. Consult the datasheet or following the track of the old board for pinout. There are four pins but usually used as three, +5v, GND and output signal.     

Simply connect it onto Xprog PCB as per the images, which is the setup prepared on Xprog in circuit. When ready, now power up Xprog by USB then you can proceed with usual ATmega programming  


Note: check carefully to ensure that the part acquired is an oscillator and not just a TYPICAL X-TAL of the same shape, which will never work on this!. The two small SMD packages in the photo can be found as they are either an oscillator or an X-tal. If in doubt, searching and comparing to the datasheet can tell.

           

[dil6222]

An alternative, if someone found the above setup is hard in practical or hard to reach by you. Another well known fix that frequently used among those AVR enthusiasts is external clock source by an oscillator.

You could find such oscillator unit from an old board, any frequency of no more than 10 MHz should be fine but you could success with one of higher frequency as I did. Consult the datasheet or following the track of the old board for pinout. There are four pins but usually used as three, +5v, GND and output signal.     

Simply connect it onto Xprog PCB as per the images, which is the setup prepared on Xprog in circuit. When ready, now power up Xprog by USB then you can proceed with usual ATmega programming  


Note: check carefully to ensure that the part acquired is an oscillator and not just a TYPICAL X-TAL of the same shape, which will never work on this!. The two small SMD packages in the photo can be found as they are either an oscillator or an X-tal. If in doubt, searching and comparing to the datasheet can tell.

Hello zmann thanks for adding helpful info here m8 much appreciated 

[relly_boy]

Hello all this should help users who have locked atmega64 on xprog and can not read or program chip anymore. 100% way of unlocking after hours/weeks of research and testing.

This is done off board with qfp64 breakout board should be able to  program onboard xprog also though.


easy fix all you need is:

1. UPA PROGRAMMER 

2. USBASP WITH SLOW CLOCK JUMPER ON  
     EXTREME BURNER SOFTWARE AND 10 TO 6PIN ADAPTER 

3. JUMPER WIRES FEMALE AND MALE

4.QFP64 BREAKOUT BOARD 

let's get started

 1.     First of all connect jumper wires between atmega and usbasp
       you will need to split vcc + into 3 wires and gnd - into 3 wires 

Connect vcc+ to pin 21,52 and (64 i believe optional as for avcc i test later) 

Connect gnd- to pin 22,53 and 63 

Connect SCK to SCK

Connect RESET to RESET

MOSI to PE0    (common problem is people using PB2 and PB3 as there listed as mosi and MISO but they are not )

MISO to PE1 

You should end up with something like this you can see I've split the and vcc 




2.   Next connect PIN2  from UPA DB9 SOCKET to XTAL 1.

Now connect everything else usbasp and upa to usb etc 



Now comes the fun bit 

3.   Open upa go on tools then pulse generator and you will see this:



Change frequency to 1000khz and click start and leave it running.



 4. Open extreme burner avr and go to fuse settings tab and click on read 
        atmega should connect as normal



5. Go on each set of fuses low, high, extended lock go on bit details and click load default value for each set
   Then tick all the write boxs and click write.   or you can manually enter the following  
(  Low E1,  HIGH 99, EXTENDED FD, LOCK FF then click write these are factory lockbits. see photo



6. Go on low fuses and check the following clksel settings are  there

Cksel0   (1)
Cksel1   (0)
Cksel2   (0)
Cksel3   (0)



Now erase chip and then disconnect upa 

That's it all done it should be able to program/ read as normal without upa sending signal to xtal1 on mega.


 Hope this helps many  CT members to unlock atmega 64 so it can be reused not tossed into the bin 

I've spent many hours tearing out my hair to bring this guide so PLEASE leave thanks and rep if it helps 

Many thanks dil6222

HI.. is this applicable for my xprog-m 5.84 with the same mcu(atmega64a)?..

[raffy haddad]

Yes it should be same
as all xprog
regards

[relly_boy]

Yes it should be same
as all xprog
regards

i think too.. because its the same atmega64.. but  im looking for someone who had experience on this version..

[dil6222]

Yes it should be same
as all xprog
regards

i think too.. because its the same atmega64.. but  im looking for someone who had experience on this version..

relly they are the same mcu the only difference with 5.84 is firmware that is programmed into mcu is different 

[relly_boy]

Yes it should be same
as all xprog
regards

i think too.. because its the same atmega64.. but  im looking for someone who had experience on this version..

relly they are the same mcu the only difference with 5.84 is firmware that is programmed into mcu is different 

do you have any procedure to do it?.. thanks