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This bl2 issue has been fixed by this PR: https://github.com/armbian/build/pull/8464 mt7988/i2p5ge-phy-pmb.bin is a firmware for the 2.5G upgrade of BPI-R4 (replacing one of the SFP with 2.5G ETH). This version of the armbian kernel is based on the mainline (patches are entirely from OpenWRT), so there are some imperfections. If support for bsp is needed, it will be tested and added in future work. Additionally, this firmware is supported by community enthusiasts like me and is .csc support. It is not OFFICAL support, nor is .conf support. The work of this SBC requires everyone to work together.

The kernel drivers for T527 from Allwinner still have issues (yes, even the original manufacturer's drivers have issues), including but not limited to HDMI and audio. The original manufacturer's drivers also have requirements for the gcc version. Furthermore, Allwinner currently has not provided a solution (perhaps it has not been made available to individual developers yet).