After upgrading from v1.2.6 to v1.3.1, my upload speed dropped from a full 1000M up/down to 1000M down / 100M up only. The issue affects all Wi-Fi clients without exception - Wi-Fi 7 and Wi-Fi 6 devices, 6GHz and 5GHz bands, PC, Laptop, MacBook, iPhone, and iPad. Wired connections are not affected.

Troubleshooting steps already tried:
- Factory reset, then reconfigured from scratch - no improvement
- Disabled OFDMA and MU-MIMO - no improvement

For about a year I have been very satisfied with the Wi-Fi 7 throughput on every firmware version I used. This is the first one that has caused a problem.

I understand there are real reasons to be on v1.3.1:
1. Updated wireless driver for improved security and stability
2. Optimized VPN performance

However, the upload regression makes the upgrade untenable for me.

Is there any way to downgrade the BE550 V2 from v1.3.1 back to v1.2.6? It appears downgrading may be blocked by design, so professional guidance would be appreciated.

Any help is appreciated. Thank you.