Question Unable to boot, can I recover? - Xiaomi Mi 11i / 11X Pro / Redmi K40 Pro+

Hi!
I tried to install this rom to this device. I put it into fastboot mode, booted twrp from there, copied the rom zip to the root, and installed without problems. Then I wiped Dalvik and tried to restart the phone, only to boot into twrp again (twrp was already installed I think, this version: 3.7.0_12-RedmiK40Pro+_v6.7_A13). The original system I think was the factory 13.03 Android.
Now the folders on the phone seem different in the twrp browser, and I cannot seem to locate the zip file of the rom to reinstall. Internal storage shows size to be 0M. Maybe this was the mistake, but in an attempt to fix things, I changed the Slot to slot B, which was successful, but only booted into fastboot. Then, when I tried switching back to Slot A again, it gave errors for not being able to mount certain partitions, as seen in this image:
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}
I then tried to copy the rom to a pendrive and install it from there, but it showed a similar error. When connecting the device to the computer, it shows up, but I cannot open it in a file explorer. Unfortunately I did not make any backups beforehand. Do you think there is a chance of bringing this device back to life again? It was given to me with instructions, because I'm a "computer person" and I thought it would be an easy process as I have done this my phones many times without problem. What could be the issue? If you need me to include any logs, or photos of the errors, let me know. I'm really worried that I might have bricked this device. Thank you for your help!

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gaspargergo said:
Hi!
I tried to install this rom to this device. I put it into fastboot mode, booted twrp from there, copied the rom zip to the root, and installed without problems. Then I wiped Dalvik and tried to restart the phone, only to boot into twrp again (twrp was already installed I think, this version: 3.7.0_12-RedmiK40Pro+_v6.7_A13). The original system I think was the factory 13.03 Android.
Now the folders on the phone seem different in the twrp browser, and I cannot seem to locate the zip file of the rom to reinstall. Internal storage shows size to be 0M. Maybe this was the mistake, but in an attempt to fix things, I changed the Slot to slot B, which was successful, but only booted into fastboot. Then, when I tried switching back to Slot A again, it gave errors for not being able to mount certain partitions, as seen in this image:
View attachment 5810281
I then tried to copy the rom to a pendrive and install it from there, but it showed a similar error. When connecting the device to the computer, it shows up, but I cannot open it in a file explorer. Unfortunately I did not make any backups beforehand. Do you think there is a chance of bringing this device back to life again? It was given to me with instructions, because I'm a "computer person" and I thought it would be an easy process as I have done this my phones many times without problem. What could be the issue? If you need me to include any logs, or photos of the errors, let me know. I'm really worried that I might have bricked this device. Thank you for your help!
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how about flash over mi flash, stock rom