Given that Beta 3 is a Chinese manufacturer (based in Enping, Guangdong), official service documentation can be challenging to find on generic search engines. Here are legitimate methods:
Registered service centers have access to the private FTP server. As an independent technician, you can register for a "Partner Account" on the official Beta 3 website, though you may need to verify your business tax ID. Beta 3 U15a Service Manual
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