VIVO Y20 aka VIVO V2027
vivo y20 signal is lost, the process is broken by cellphone
Unpack the can carefully
try to check the SDR425 ic, 
it turns out that there is a short
then remove ic sdr425 replace with ic WTR3925
the first installation of a fast 4g signal for Facebook and WA sometimes it comes in sometimes it doesn't
then try to remove the wtr3925 ic again and reprint the legs, then put them back in
everything went smoothly without any problems
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