s3 stucck on logo

[Asiya Zafar]

plzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz help me s3 stuck on logo . i had this problem before but i solved it with kies but know kies says this device can't be up graded and cant find alink that completely download frimware for s3 gt-i9300 for region xsg(united arab emrites)

 

[Roy Mustang]

how to flash modem

I have never flashed a modem seperately so please go through this entire thread http://forum.xda-developers.com/galaxy-s3/general/ref-galaxy-s3-modem-radio-collection-t1740061

Also i recommend you to follow that video carefully and flash firmware again before flashing modem.
Please also search for your country specific firmware on google and if found then flash it through the same steps as in the video.

Let me know if that works or not, it's 2 am here and time for sleep, i will later see what can be done if reflashing doesn't work.

 

[Roy Mustang]

my imei number onthe back of sticker and the device showes me do not match at all

Sorry i forgot the whole thing about imei no.
Since your imei no. Is changed hence it shall be the reason of you not being able to make calls.
Follow this video, I hope it shall fix things https://www.youtube.com/watch?v=_AlQmfMJBK0&feature=youtube_gdata_player

 

[Asiya Zafar]

Is it for gt-i9300 because the second step in this video qualcommm usb setting doesnot appear

 

[Roy Mustang]

Give this thread a read.
It also states to try flashing the firmware again.
[REF] IMEI / EFS - Know this stuff (i9300) -… | Galaxy S3 | XDA Forum

Download UAE specific rom from the below link.
http://www.sammobile.com/firmwares/3/?download=26617