Quote Originally Posted by Giomen View Post
BUT REMEMBER!!! In most of case downgrading of 205 series devices from version above 5.10 will kill device without any recovery possibility! Only physical low level programming of internal memory chip give certain chance to success
I downgraded my nüvi 255W from FW 7.60 to 5.00 without any problem.

Quote Originally Posted by Giomen View Post
P.S. But I know that you want compare this version with old true original 250W SW - you can see it is absolutely different device and it have not synchronized SW.
Reason I needed FW 5.00 is that I wanted to establish in which FW version the support for map files larger than 2 GB was added. I can now confirm that this happened as of FW 5.10 dated 8 June 2009 (FW 5.00 does not yet support maps > 2 GB).

This support not mentioned anywhere in the change log. I wonder why, since the change log of many other models does mention it, for instance nüvi 5xx with FW 3.40, or nüvi 8xx with FW 4.70, or zumo 4xx / 5xx with FW 4.90 plus a collection of older handheld outdoor models. An important enhancement like the support of file sizes > 2 GB belongs in the change log, also of the nüvi 2x5 and 2x5W...