Yes I supposed... But only higher sbf since you won't be able to downgrade. So practically from 2.3.3 to higher like 2.3.4.. But I did read somewhere that someone like your case was able to flash back to 2.2.2.. may be walter could help you. Please pm him..
Sent from my awesome Moto Defy: Stock Rooted Gingerbread 2.3.3 - XDA Premium
Defy MB526: Multitouch Custom CM10 - 4.1.2
: Rooted : 2nd-boot : Overclock 1100Ghz: 720P Recorder :
Transformer TF101(B60): JB Katkiss 4.3.1 build 027
System Speed: Overclock Dual Core 1400Ghz