7373 v5.50 can't downgrade
 

I try to downgrade with ufs and jaf to 3.90, 4.70, 5.00 but unsecessfully.
only blink after swith on, no local mode.
with 5.50 works fine.
what to do?

Try to downgrade it with Universalbox.
Or try to backup simlock + crt.
then erase flash-> full flash-> restore simlock& crt
BUT sometimes it goes to contact service. Its a risk...
So its not so good. But an idea

hi
there is no problem to downgrade 7373 i tested today with two brand new pcs with 5.50 you can use f-bus or dku-2 with mt-box ,but with jaf i didnt made it always error write or something

5.50 to 5.00 is working. Tried it today with UB.

i will advice u to use usb dku -2 cable and it will work
Bonne chance