Just launch the "System Update" app, it will tell you there is a new update and give you the option to download and update from there (if your phone isn't rooted).
If your phone is rooted or you don't have the "System Update" app (because of reseller ROM, etc.), go to the link I posted a few posts back to download the update manually.
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I have found that my phone cannot boot if it is not connected to a charger! It will be caught in a bootloop if it runs on battery...
I will try to replace the battery to see if it improves things. I have a screenshot of battery voltage for comparison, what value for voltage do you get? You can reach the screen using the *#*#4636#*#* code in the phone caller.
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your phone's mV is fine (3800 when not charging).
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On another note, after the 18S update a WiFi Speedtest gives me very slow download speed (0.50 Mbps, should be 25-30) but the usual upload speed (25 Mbps). Browsing/surfing is slow. Anyone noticed this as well? Might be my ISP though, will test on other WiFi
-edit- nvm, has something to do with my router's WiFi settings (don't know what though :/)
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