In Need of serious help!!

I thought I made a full backup with Dejan, but only read from 00200000-00300000 and I thought I could upgrade to a new version, so I wrote v5.27 to it. and that was 3 Mb. Now I'm trying to write back the full 301 version back to the phone, but that is only 1Mb. So I wrote bad data between 00300000 and 00600000.

How do I upgrade the sw to a higher version?

How can I get the 6210 working again?

Thx,

Marcel