As gathering some more feedback from users i will give an update to this thread hoping that i cover at least some of the problems that occured since the last update.
1. Some users noticed me they can't make OEM toggle show even after waiting those 168h, for me last time i got locked on purpose i managed to make it show after 3 days (72h) without doing anything specific. For the moment my advice will be to flash oldest firmware available for your device that has same bootloader and modem revision as your current, and try again with date trick or with waiting 168h.
You can find out what bl/modem rev you have by checking the current build number of your current rom. Let's take A520FXXU7
CRL8 - in this build number 7 is the revision, leave other numbers and letters for some other time. To be able to flash older firmware it must be same revision, or odin will fail
. Search on the firmware related websites for older fw of your phone/region that has that same revision. So for the device mentioned before A520FXXU7CRHA is the oldest fw that can be flashed.
2. Pie is out. Funny that, but it also has new locks, new things, all still new to everyone, fixes not working yet and so on. Few people including me got locked on Pie and we found some workarounds to it to prevent data loss.
First of all, old patch doesn't help anymore so flashing it will be pointless. The RMM v2 is called KG too (KnoxGuard) which also comes attached with the apk that throws you in "payment lock" if you delete it. You can see it in download mode as "KG state = prenormal" if you have the lock. Do note "KG state = checking" is harmless (phone is unlocked)
, that's how it is on most of the devices.
My personal advice for this is to reflash Oreo bootloader and modem
(which i did), ofc following the rules posted at 1), bootloader and modem being same revision as your current. Flashing oreo bootloader and modem will force the phone from RMM v2 to RMM v1, and since pie doesn`t have anymore files of RMM v1 inside, will simply get unlocked (for the moment). Now, this is not a permanent solution because things may change in pie and require updating of bootloader and modem.
My friend @_alexndr
an alternative way, as the oreo method, which concludes in flashing full pie firmware and wait to get unlocked by itself, either flash oreo, get ota update to pie and wait to get unlocked by itself.
The real issue of this is that we couldn't find yet the secrets behind the new locks so, without a flashable patch to disable further locks, it can come in any custom roms, stock roms rooted etc.