Your 1) means the procedure described in your backdoor document ? This code allows to boot using a cliplead.
Yes I havn't yet included this code.

I've tried to add the following code just before jumping to the GoToBoot code :
WDTRST = 0x1E;
WDTRST = 0xE1;

This should launch the Watchdog. The issue is still the same. There is surely something else wrong... I'm investigating

Thanks
Stephane