[Q] WiFi setting still in phone after flashed with new ROM

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Hi,

I am new here, and this is my First post,

I am running stock ROM 4.03 (I9100MUGLD3_I9100MBMCLD3_BMC), I did a "wipe data/factory reset" and then update the new ROM 4.12(I9100MUGMA5_I9100MOYCMA5_BMC) by Odin 3.04.
In this case, my phone should be wipe and has a new fresh look and my setting should be all gone. but I found out my WiFi connection for work still list inside my phone, and when I back to work, the WiFi connected automatically.

so, I tried again, wipe data/factory reset, flash it back to above Original Bell ROM 4.03 (I9100MUGLD3_I9100MBMCLD3_BMC), when I back to setting, my company SSID still in the phone. so I root the phone and wipe data/reset, then flash it to (SuperNexus-2.0-i9100-BUILD1) by using the MicroSD Card. my company SSID is gone, so I did a wipe data/reset, then flash it back to 4.12(I9100MUGMA5_I9100MOYCMA5_BMC) by Odin 3.04. again, my company SSID come back in my wifi list. and when i back to work, wifi connect again.

is there something I didn't do it in the right way to flash a new ROM?

or how do I completely erase EVERYTHING in my phone, in case I give my phone to someone else?

also, after I flash to different ROM's(GalaxyMOD_XWLPX_v3.01_by_AJ, BestS2ROM v1.1, Galaxy S2 I9100XWLS8 (4.1.2) - Spain, I9100XWLSD_I9100OXXLS6_I9100XXLS8_NEE), the serial number of my phone became PPPPP, but when I flash it back to Stock ROM, my serial number back to normal. does anybody else have the same issue?

Thats because you log in with your google account and selected the option to restore a backup from your google account. Wifi passwords are saved into you google account (if you select that option).

Re: [Q] WiFi setting still in phone after flashed with new ROM

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Don't double post god damn it!

Sent from the little guy