crwdns2934241:0crwdne2934241:0 prp

crwdns2934249:0crwdne2934249:0:

Remove/disconnect both batteries. Remove RAM. Disconnect "button battery".

Wait more than 1min.

Reconnect all.

It worked for me.

crwdns2915684:0crwdne2915684:0:

open