Also, the AV Famicom and AVS have no SD errors with the Everdrive betas, but the top loading NES with adapter does. This is after multiple reformats. Also, on AVS firmware 1.30 final, the Everdrive had similar SD issues in PAL mode, but not in NTSC. AVS firmware 1.30 beta 5 is fine in PAL mode with the Everdrive betas.
I also have a front loading NES, but the everdrive doesn't fit with the adapter, so I wasn't able to test it.