GPGeMMC Box provided Special Adaptor for ISP and JTAG. Make sure for ISP read and write use ISP Adaptor/Jig and for ISP writing Use ISP correct Files. Don't use ISP files into JTAG and don't use JTAG files into ISP. ISP files are like this Boot1, Boot2, USER, etc. and Jtag files don't have Boot1. Boot2, User etc. so 1st of all make sure of this. 2ndly Triple Check your Soldering use Good Jumper Wires for Soldering and Good Solder and Good Iron. after all Trip Check if still you are getting Bad code error can be cause of two reasons 1st phone can be Hardware and 2nd use this method to make sure it's hardware issue or not.
Check this picture
Some phones need Extra Current of 3.3 Volts and these type of phones not connect with box. when you try to connect it with GPGeMMC you got error
eMMC ORC: 00000000, bad code !
>> Id check lost
what you have to do is make sure your soldering are 101% correct after confirm just put 3.3v to ISP jig. Keep in mind no need to sold any extra 3.3v to phone. just you have to sold extra 3.3v to ISP adaptor. these kind of error comes on N7000, I9300, N7100 etc so i had tested many of these phones which was giving error so i research and found this solution and it's working fine. If you have I9300 type phones which no need 3.3 volts that type of phones need VCC which is 2.8 Volts. for those type of phones just put 2.8 Volts to ISP adaptor and phone will connect but again before Putting External volts you make sure your soldering is 101% correct. So for those type of phones which have Vcc pinouts and mobile giving error of bad code then you need to put 2.8 volts to VCC on ISP adaptor not to phone. and which phones have 3.3v pinouts and mobile giving error of bad code then you need to put 3.3 Volts to 3.3V on ISP adaptor not to phone. But again make sure your soldering are 100% correct. and IF even that phone showing BAD code error it's means your eMMC ic is TOTALLY DAMAGED !!!
here is some pictures i want to share with you
i got N7000 trying to repair it. but it's not connecting. i sold wires and verify it. even thing was fine but phone was not connecting here is screen shot ( i didn't sold External power on this screen shot )
then i sold External volts check here ( i use Battery to give 3.3 Volts )
after sold external power here is the results
and mobile Successfully Repaired !!!!