Root and Bootloop problem fix [Tested on RMX1993EX]

I tried to root my device with this instruction: https://forum.xda-developers.com/realme-x2/how-to/root-howto-t4011357
But I don't installed Manager.apk first. That might cause. But I don't know cause clearly, device was in boot loop.
I tried flash vbmeta and boot etc. but hadn't got luck.

Finally successfully turned on with stock ROM and then installed custom ROM and rooted.
My model is Euro RMX1993(EX)

Here is the what I did:
1. Installed...

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