SE C905A upgrading CID53 losing Sim Free

my friend gave me his phone
Sony Ericsson C905A
Specs :
DB3120
R1FA035
CID : 052
RED
(According to A2Uploader)

for some reason the phone got a messed up screen half screen with colors points and mostly cant see nothing :a006

i want to upgrade to files Download Section:
R1FA035 RED CID53

will i lose the phone Sim Free Function?
can i use different FS/Main files to keep the Sim Free and keep the Hebrew too..?

Thank you

You can upgrade or flash your mobile phone whenever you want, and if your phone is unlock will not miss the unlock.

And yes, you can apply the FS and
MAIN of the download area although
they say CID 53 and nothing will
happen to you phone.

Remember that FS and MAIN have to
be the same version of firmware.

Has and will depend on the FS moving sconces you stayed with the language you want.