can't downgrade use the miwifi tool, you can try corrupting the file system.

[dlinkqu]

Miwifi tool allow same version upgrade, when upgrade, it will erase both rootfs1 and rootfs2.
try to power off when in upgrade write flash process :
Fllower step:
1: corrupting rootfs2. Enter recovery mode, after FW TFTP transfer finish about 12s, miwifi tool start erase rootfs2, power off;
2: corrupting rootfs1. Enter recovery mode again, after FW TFTP transfer finish about 5s, miwifi tool start erase rootfs1, power off;
3: power on, router will restart loop.

now we can downgrade any version.

succeed on BE3600 2.5G v1.0.87.

[GreyTalon]

dlinkqu! - u awesome!
this your trick is fully worked and i well done grade down my 087 fw to 068 - root it - and back it again ! ( thats was not tottaly easy... and not at once ( not even 2nd try).... - but 🤙) )

tnx man ! )

зы: пруф! 👽

[pim-pam-toma-lacasitos]

Miwifi tool allow same version upgrade, when upgrade, it will erase both rootfs1 and rootfs2. try to power off when in upgrade write flash process : Fllower step: 1: corrupting rootfs2. Enter recovery mode, after FW TFTP transfer finish about 12s, miwifi tool start erase rootfs2, power off; 2: corrupting rootfs1. Enter recovery mode again, after FW TFTP transfer finish about 5s, miwifi tool start erase rootfs1, power off; 3: power on, router will restart loop.

now we can downgrade any version.

succeed on BE3600 2.5G v1.0.87.

Thank you so much! You're amazing!

I'm leaving this video here in case anyone needs it.

https://youtu.be/iHX1ijOo6XM