Ecco i limiti del downgrade. Trovate il modello della vostra scheda madre e saprete il firmware che montava al momento dell'acquisto:

Modello--------------------Limite del downgrade
Fat 40GB CECHG04------OFW 1.90 (Max. Downgrade)
Fat 40GB CECHH11------OFW 1.97 (Max. Downgrade)
Fat 40GB CECHH04------OFW 1.97 (Max. Downgrade)
Fat 60GB CECHC04------OFW 1.00 (Max. Downgrade)
Fat 60GB CHECHA01----OFW 1.00 (Max. Downgrade)
Fat 80GB CECHK11------OFW 2.30 (Max. Downgrade)
Fat 80GB CECHE01------OFW 1.00 (Max. Downgrade)
Fat 80GB CECHK04------OFW 2.16 (Max. Downgrade)
Fat 80GB CECHE11------OFW 2.40 (Max. Downgrade)
Fat 160 GB CECHP04----OFW 2.45 (Max. Downgrade)
Fat DECR1400A-----FWD 2.60 (Max. Downgrade)

Modello--------------------Limite del downgrade
SLIM 120Gb CECH2004A------OFW 2.70 (Max.Downgrade)
SLIM 120GB CECH2001A------OFW 2.70 (Max.Downgrade)
SLIM 120GB CECH2101A------OFW 3.20 (Max.Downgrade)
SLIM 160GB CECH2504A------OFW 3.40 (Max.Downgrade)
SLIM 160GB CECH2511A------OFW 3.40 (Max.Downgrade)
SLIM 160GB CECH2501A------OFW 3.41 (Max.Downgrade)
SLIM 250GB CECH2004B------OFW 2.70 (Max.Downgrade)
SLIM 320GB CECH2504B------OFW 3.40 (Max.Downgrade)