At first...what are output of:
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cat /mtd_rwarea/Version.0
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cat /mtd_rwarea/Version.1
If you have trouble with automatic and semi-automated roll-back process - no one said before, that it works on all models, the last way for you to have earlier fw - flash images of the earrlier fw by hand (as a lot of people made). This manual was born from the topic here. Read whole topic and you will know all about this method. On the wiki you can see modification, where not operating, but alternative partitions are re-flashed. Its dangerous and you can brick TV or you can have alternative firmware. Its your choice. All what you need - telnet enabler and working console.