Bluetooth Not Connecting After upgrading - MTCB Android Head Units Q&A

Hello friends after upgrading to last 5.1.1 malaysk the B / T adapters lost its settings and refused to connect up to the blue with MTCB 1024x768 RK3188 23 Rom of malaysk I had no problem both the mobile phones and the ODB They had impeccable connectivity.
Trying to downgrade to Kit Kat 4.4 23 malaysk again it is not possible to have functional B / T incredible.
Please give me a help thank you
Edit: The problem was solved was clean install a 5.1 factory Rom and was again operating Bluetooth

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I have KGL 3066 1024x600 unit but when i upgraded Malaysk march firmware somethings strange happened :
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all other functions are working normal , I tried to go back to stock firmwares 4.4.4 , 4.4.2, and even 4.2.2 jelly bean with no hope i tried almost all mcu from 1.77 till 2.83 and nothing changed , on every firmware i erased every thing before and after flashing
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paulaadel said:
I have KGL 3066 1024x600 unit but when i upgraded Malaysk march firmware somethings strange happened :
wifi , bluetooth , GPS & USB ports not working at all !!!????
all other functions are working normal , I tried to go back to stock firmwares 4.4.4 , 4.4.2, and even 4.2.2 jelly bean with no hope i tried almost all mcu from 1.77 till 2.83 and nothing changed , on every firmware i erased every thing before and after flashing
then i tried Malaysk April firmware and nothing happened.
I noticed that there is no serial number or wifi mac address on all firmware's i tried
i am really depressed with my unit plz i need help
thanks
Click to expand...
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Hi! I\m facing the same issue and I need the jelly bean 4.2 update file, once I wrongly try to upgrade without saving the original unit's files update and mcu. Could youy please send to me the files you have so I can try to resurrect my unit? Thanks! Kind regards Anderson

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