oh it was new after all

i knew there was an update for my 4150 but i did not bother since i has not problems. last night after a few bluetooth problems i thought hey why not upgrade

luckily it was an even newer image

dated 2 Aug.
made a backup
flahed with the new rom
restored the backup
everything work fine and no problems at all

i know doing so is not recomended but hey, it works

if i ever get weird problems i will do a clean setup but so far works flawlessly.