Good morning
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Now let's go to the part of your problem, ufi box/dongle with that model is having problems with the server, also depends on the region, country where the order of access to the server to allow us to do any operation, there are many limitations, seeing logs of users who live in India or in many Asian regions there are no problems of server requests, out of there if I have seen many problems.
Use miflash pro but in recovery mode, but you can only update the xiaomi at no time the software will let you degrade, miflash pro you can also download firmware in zip format, the connection mode goes into recovery mode and you choose the option connect miassistant and in miflashpro the option or section recovery if it recognizes you the imeis is compatible and you can update.
If you want to use spflashtool you need an authorized xiaomi account, it's the solution right now or you know someone who has it and make you a remote