VVDI MB Error 1001 when Renew Original V51 Key?

 Problem:

I have an original Mercedes V51 nec key with me that is dead – unrecognized by eis, now I have made a BE/BGA key already and got the vehicle started already but would like to play around a little more and why/how/where the key malfunctioned, prolly corrupt mcu data since I can identify the key by xhorse vvdi mb via ir and nec key adaptor but when I try to read key password, it gets stuck at 50% then returns error -1004, and when renew I get error -0001, why does this happen? is it because I am using the older nec adaptor?

Solution:

Either use the new solder free adapter or bridge the pads conn 2&3/whatever combination depending on chip type, it worked for me.

 

Read also:
How to Renew Benz NEC Key with VVDI MB & Key Tool Plus?