Hello,
I just installed openwrt on my Xiaomi ax3000t. I have followed this tutorial : https://openwrt.org/inbox/toh/xiaomi/ax3000t
Everything works well but now I'm asking myself if I need to start the step "Change to OpenWrt U-Boot", is it necessary ? Or is it for specific use ?
My goal is to get rid as much as possible of Chinese software.
Thank you
Check the page carefully, the explanation is right there.
Default available space is 60Mb.
OpenWrt U-Boot provide faster boot loading
and more space:
75Mb (with recovery) or 85Mb (without recovery).
It is not necessary, unless you need more space on the device.
Then you can replace the bootloader. Just be aware, that the risk of bricking your device is higher.
Thank you, I don't think the risk is worth it for my usage 
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Thanks! 
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