try to use my vortex v1.4..v1.5 not release yet..on processing..until now only a few mods that i can put in my cfw..not enough space..so i have remove some themes and add other nice theme(Symbian^3 Icons).. 

Doesn't matter about the Symbian thingy.

Yes I did a fresh firmware re-update from V40 to v52 Via USB , around Rm150mb++ for that if not mistaken.
Still the phone will keep auto turn off which I dunno why ><

wat u mean by symbian 5? Symbian firmwares are hard coded to prevent virus attacks or any other malicious codes from destroying the fone.

However, the virus on maximum possibilities will only attack yor memory card and never on ure fone.

The reason u face this issue on the fone is due to some halfway uninstalled, clashing with system or there's an error on the firmware.

A fresh firmware re-update is necessary to solve this issue ..

Replying from my NC6-00

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Added on February 15, 2011, 11:18 am

garmin's data stored in the sdcard, therefore garmin will fail to execute without the supporting files. Ure explanation misleading 

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Added on February 15, 2011, 11:21 am

full format ure sdcard, and prevent keeping larger than 100mb files into the storage card to avoid such issues, also dnt install applications into storage card..

I not sure is this true or not...seen form other forum...
Plug in the stylus to the 3.5mm jack and select Headset... DON'T TRY THIS, THIS CAN DAMAGE YOUR 3.5mm JACK! IF U TRY DUN BLAME ME

which CFW is better?
it's depend on the user's needs
because every CFW has diff mod

and one more thing
watch out before flashing
read the instruction carefully
if not u'll end up the CFW is corrupted or brick phone

first of all what kind of needs u want for ur phone?