Replacing the eMMC of Redmi Note 4/4x (mido) is possible using UFi Box.
I'll guide you how to replace emmc for Xiaomi Redmi note 4/4x qualcomm.
Please follow this guide carefully :
Prepare new emmc, just do nand test and factory erase after Identify emmc
Resolder emmc to board, plug usb, and device will stuck in emergency mode(9008)
Open Ufi Android ToolBox
In Qualcomm tab, please select Brand, model according to your device
This is Important step : Load developer china rom, uncheck Restart after flash
After finish flashing, Do Not Restart or Reconnect the USB.
Do Identify Device Again,
Go to Special Task, Dissable DM verity and force encrypt with Sig Overflow
After this, you can reboot the device.
6. If you want to flash global rom, make sure you have unlock the bootloader at first, otherwise you will get wifi problem.
Dear bro wasim jee i am sorry to say you that I need ufi box new setup 1502 only ufi exe size is almost 11 to 12 mb can you share it to me i am from Kashmir there is no internet for last 8 months now only 2g internet is working speed is 230 bytes only i can not update my ufi if you give me this file that will be your great kindness thanks bro