[Magisk] downgrademagisk:
So I've the following Problem. I updated Magisk from 16.7 to 17.1/17.3 (tried both) and also the Manager from 5.3.8 to 6.1.something. I simply can't for the heck of it downgrade it again to 16.7. I've one and only one issue with 17.1+, my phone won't detect any SIM, the only fix I've at hand is to use the stock update.zip from my ZTE Blade L7 to revert it and get my SIM to work, boot into recovery and apply update from SD card. So atm it's either, have root but no SIM or have no root but a working SIM. I tried the following:

- Install magisk16.7.zip from stockrecovery, gives me zip autentification error.

- Flash the magisk16.7.zip via fastboot, gives me the target didn't report max downloadsize error. I've OEM unlocked and USB debugging enabled, also, flashing the patched_boot.img via fastboot works everytime.

- Rename the magisk16.7.zip to magisk16.7.apk and install it, gives me a parsing error.

- Access the apk from within the magisk16.7.zip and extract and run it. It showes me the Magisk Icon and it seems to be about to install normally like any other app but it stops and says "magisk Manager not installed".

I don't have access to costum recoveries like twrp etc, because the ZTE Blade L7 isn't supported anywhere. With such costum recoveries I could disable the zip verfication check I guess. Also rooting it with other methods won't work either, for example kingroot.

Also what's weird is, when I uninstall magisk manager 6.1. for another attempt and install the older 5.3.8 wich I had with magisk 16.7, the manager gives me no other option but to update to 6.1 again, it won't let me install 16.7 wich I have on my SD and when I update the manager to 6.1, then I only have the option to install magisk 17.1 or 17.3 as zip. I can't patch the stock boot.img beforehand. It's realy confusing. Also I'm not 100% certain but is it correct that you've to use the corresponding manager for the right magisk version? So, magisk manager 5.3.8 for magisk 16.7, mm 6.1. for m 17.1+ and so on?

Magisk is cool and good, it's the only way of rooting my ZTE Blade L7 it seems, I hope topjonwu fixes this SIM detection bug soon or somebody gives me a simple method to downgrade.

update:

I'm still trying to find a solution. It seems the reason behind the SIM issue is that when I flash the patched boot.img my IMEI gets messed up. I tried to find some way to restore/edit the IMEI, but to no success. Also another method would be to install a costum ROM like lineageos, but this doesn't work for my ZTE Blade L7 aswell. This entire thing is sure a hard nut to crack, I already put too many hours into this. Please somebody help me, I can't be the only one with this SIM error when using Magisk 17.1/17.3

second update:

Installed the brand new magisk 18 today, SIM error persists. Checked the IMEI, weirdly, IMEI for SIM1 is not aviable but SIM2 got it correct, yet when I try to select any SIM in settings they're both greyed out (I put the SIM in the corresponding slot). What I noticed aswell was, when magisk is installed and mobile starts anew, my SIM gets detected and works normally, but if I reboot only once it's bugged again and no matter how often I reboot it won't detect it again. Also, I installed cwm, flashed the costum recovery for zte blade (zte blade L7 isn't supported and this was the only similiar sounding option) from within the cwm rom manager while beeing rooted, bootet into recovery from cwm rom manager but to no success, I still have the stock recovery. Intention was to install magisk16.7.zip from a costum recovery. I'm going nuts with this! Please, I just want a rooted mobile that works. Just an info for other zte Blade L7 owners, you get into recovery from:

power key + volume up > zte logo shows onscreen tap power key once > android guy on screen hold power key + tap volume up once.

To make my SIM work again I installed the stock zte update.zip from recovery. Somebody please help, if you search for "magisk no SIM" you'll find some results regarding this problem but there isn't any solution.

third update:

So I've given up for now. It's too complicated, I don't have that much time and I realy need this mobile to make calls/use the 3G for internet. It's my only stable internet connection. I'm too afraid to damage this mobile irepeairable. It seems when I flash the patched_boot.img with magisk 17 and higher something's gets done wrong with the modem/baseband settings. You can erase modemst1.bin and modemst2.bin via fastboot and do such things, but that can make things much worse. Can't backup and restore efs partition, can't install costum recoveries, can't flash modem.bin files, yet alone find the right .bin. This sucks. Magisk is the only method to root a ZTE Blade L7 it seems. Or compile a twrp recovery your own, but that's way over my head. Mods can you please rename the thread title to "Magisk 17.1 and higher no functioning SIM, how to downgrade to 16.7?" Since the v.18 came out recently. Thank you topjonwu and xda board.