Ok F2thaK and all the others explained to me

i will correct my mistakes

And for people having problem with HWsync (Hardware problem)
Disable it cause (Hwsync) doesn't work on all N900s
but IT WORKS ON 75/100 of them
anyway for people having reboot loops after enabling hwsync

try to disable self-guard using R&D mode (so n900 won't reboot)
but crashes may happen
so disable HwSync if having troubles with it