I am not sure about your version
my A620 came with v.0.54 ROM
(with alarm and speaker problem)
then I flashes to V0.70.31 mounts ago.
now there isn't any problem
The Link I gave is possibly v.70.31WWE
(Mypals in Turkey came with WWE (World Wide English))
İf U decide to Flash Go on
first make a sync for backup,
also use asus backup for emergency
(never needed by me

)
Flashing ROM isn't an update
U can think it as installing new Operation system,
So all data and programs will be deleted,
and U have to install them again,
contact list will come back , (from outlook when U sync)
copy new ROM into a CF card
then Press reset when holding Record button,
System will flash the rom itself,
in about 2-5 minitus
Good Luck.