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Battery issues, system issues ... HELP

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d0g
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Default Battery issues, system issues ... HELP

For a while now, my phone shows this weird grey battery when it's off & charging ... not the usual green pretty battery.
It's also charging super slowly ... like 10% per hour. It discharges when on faster than it charges. Keeps dying.
And I can't change the DPI ... no settings "stick", as if I can't get permission to modify system files (build.prop etc.).
I tried fixing permissions; didn't help. Tried clean flashing (slimrom); didn't help.

It might be hardware (battery) issue, but before I give up, I thought maybe to try to re-flash the firmware?
But haven't done that in years; what's the latest procedure? Which file do I flash?
I'm on Mac, so thinking to use "Heimdall".

Do I flash a firmware, then a recovery? Do I have to root again?

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roirraW "edor" ehT
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How old is your battery? Sounds like you need a new one.

Sent from my Sprint Samsung Galaxy SIII with M.O.A.R. v9.0, dkp kernel dated 3/20/2014 and TWRP v2.7.0.0.
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