How to update to beta version: go to Play Market, find BGram, | BGram Channel

How to update to beta version:
go to Play Market, find BGram, scroll the description down and tap "Join beta testing", wait for some minutes, and if the Update button doesn't appear open BGram on the phone and follow the link https://t.me/AltTG/412157
Install BGram from apk.
Just did that on mom's phone, everything worked.