I called cingular tonight because i have been trying to get my 750 paired with my tom tom one 3rd edition for use of the weather updates and cameras and such. Through conversation with a support representative, and trying to troubleshoot why it couldn't use the wireless connection of the phone, the representative asked me to check a few things on my phone. While answering some questions, one of which was about device software and such and i told him i had windows mobile 6 installed.
From this point on he led into reasons why i should be using it with out it being released and such which is to be expected. He also stated that doing to much to the phone can possibly make the phone upgradable when the real WM6 update is released. This he mentioned were changing the boot loader, IPL and SPL software in the phone, that and using bogus releases of software. The reason being he said was that the soon to be released update probes the phone deeply because everything has been updated including the boot loader stuff.
Now i cant confirm or deny any truth to these statements but the only thing i had done with mine was a try a few new firmwares but after my conversation with them i quickly reverted back to WM5.
here is a link to get it if anyone is interested in doing the same. Download either or, they are the same. included is the cheeimg.nbh and the cheediag.nbh. the cheediag.nbh wont complete is you have othere that cingular WM5 on ur cingular treo 750.
http://rapidshare.com/files/17874512...ngular_ROM.zip
or
http://rs61l32.rapidshare.com/files/...ngular_ROM.zip