1. try apply for bootloader unlock - with the "unauthorised" rom, i am not sure if binding of your xiaomi account will be successful or not. but do try and let us know if it works. if you can bind the account and approval is given then all that is left is plug into mi unlock tool, and then they force you to wait 360hours, and unlock again after the countdown finishes. after successfully unlock bootloader, copy paste china rom into root folder, boot into recovery and flash from there.

or

2. use the testpoint method - the same way they forcefuly flash the "unauthorised" rom without unlocking bootloader, but this time you are flashing an authorised china rom. nobody has done this yet from what i read in miui forum, so again, do try and let us know if it works.

******edit******

when you say custom rom i had earlier assumed you were talking about those who had the "unauthorised" global rom bought from online sales site like aliexpress/ebay .

Now let's assume that you have a unit with the mi A1 ported rom (or any custom rom like lineageOS if it exists) and you want to revert back to china rom, chances are if you already have a custom rom in your phone that means the bootloader is already unlocked (for you to flash a custom in the first place), so what you need to do is just copy paste china rom into root folder, boot into recovery and flash from there. maybe you already replaced the stock recovery with TWRP even.

alternatively again, test-point method.

to my understanding, u need to testpoint flash china rom,  unlock bootloader only can flash fastboot.

but i was wondering if you can flash testpoint might as well flash the global rom instead of china rom?

Just reject Wow Phone Redmi 5+ from LEX courier. Don't have time to mess around with a faulty phone. Very unethical vendor.

Just wait LZD email for refund.

for  my case when parcel returned to sender,

lazada give store credit after 3 days

i also need to know, coz my parcel is on the way,if direct d can warranty it, i dun need to return it..

all the return unit they will reflash and resales it via online....
Goodluck....maybe just change new packaging claims as global unit as well... 

of coursed for them is Money 1st...they wont do rugi buisness othewise how they survive & keep opening new branch 

the warranty claims quite hassle if u bought from directD...check google...

he say he can get, ask him lah
we dunno

aiya...check the thread la....     

some of them get RM620 Gold 4+64GB from wow phone....
Bro [email=ashraf095]ashraf095[/email] get it for RM583 4+64GB  only

nevertheless, it is a fact that people can get it cheaper somewhere else
do some digging, research a bit;
then buy. im happy if other people can get it cheaper also
no need to call other people off saying they bluff
have faith on fellow forumers, not all are liars

cheers!