It's not that strange, 2013 was the oldest wallet/ backup I could find at the time and just assumed that's how far back I went.
Since '21 I have found access to older emails and reference to the payouts to this wallet from a now defunct mining pool.
I first remember mining BTC on a single-core i7 CPU, so I was about even earlier than that too.
And no, this was a different wallet that I managed to crack the encryption on and was in fact an empty wallet from 2013 incorrectly named.
The i7 has always been a multi-core processor.
But anyway, you are more then likely wasting your time. The odds of finding the file with any kind of good data are just about zero.
After all this time, and an older phone like that with limited storage vs. today's phones with tons of storage the data was more then likely overwritten more then once.
Even a quick wipe and re-install of most early android phones made data recovery just about impossible.
-Dave