[Q] No 4G, frequent signal loss - Xperia Z1 Compact Q&A, Help & Troubleshooting

When i got the phone everything was working, when i flashed the uk unbranded firmware (instead of croatian t-mobile branded) I don't get any 4G signal and there is frequent signal loss when I don't have any signal.
Any fix?
I have been thinking of updating through pc companion, but I don't know if it will update to another uk unbranded or croatia t-mobile branded-which I want to try because of 4g and signal loss fix

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[Q] Cellular South Radio

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My friend has the same exact phone as me. Cellular South finally rolled out Android 2.2 a couple of weeks ago. He is not experiencing any signal degradation. My baseband version is 2.05.10.08.11, his is 2.15.00.02.17.
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Galaxy Nexus radio problem (signal drop)

Hi everyone.
I have a problem with my GSM Galaxy Nexus. The phone drops the signal on a random basis, very often, even when I'm calling.
I have the latest version of Jelly Bean installed, via official OTA (4.1.2). I am not rooted.
I have installed the ClockworkMod Recovery to try new basebands. My phone has the XXLF1 baseband, but I tried also the UGLH1 and the UILE1. Same problem. I've also checked the RIL: it matches with these radios I tried.
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Thanks!
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https://play.google.com/store/apps/details?id=com.sibbor.getril
My current ROM:http://forum.xda-developers.com/showthread.php?t=1892807
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[Q] indoor signal reception is dreadful, can anything help?

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