Galaxy Buds 2 Pro firmware downgrade

Followed instructions to downgrade to VK3 but found out that WF4 was the firmware to go.. However, I haven't been able to upgrade the firmware to any other version so far (AXA2, AW5, WF4). Was using the Galaxy Buds Client on a couple of versions too (5.10, 4.6.0, 4.5.1).

The firmware just sticks to VK3 regardless of how many times I've tried to flash another firmware. Anyone has any idea how to fix this?