N900 not updating
(Make sure you have downloaded the actual corresponding file.) The latest PR1.3 official (rootfs) images are listed below: USA The flash will take approximately 2-5 minutes after which the N900 will reboot and display the Welcome Screen with Regional settings.
After booting, you may use the backup utility to restore your settings.
There are other, probably timing, reasons causing occasional "unable to enumerate USB".
Immediately issue the flasher command again, up-arrow usually helps fetching last command to re-issue it.
Note: This method is fully compatible with 32-bit versions of Windows; 64-bit users may encounter problems.
Upgrading wipes out your If does not work (for any reason including corrupted data and/or duplicate headers error message) use your search engine of choice, with the file names below; to find alternative download locations.
This page has seen massive edits to get it in line with N900 details of flashing. v=O54Kd Lv TA2U Please see the main article Flashing N9.
N8x0 owners might want to have a look to older versions, like This page grew organically, so structuring is suboptimal. again, in case you missed it: READ THE WHOLE PAGE before starting! These descriptions assume that you are using the latest official images.
This is the easier of the two methods, and should be used by most people.
These steps cover flashing the device with OS X using the Terminal.