Did you see this, which I posted above? [quote=“acutetech, post:1, topic:257491”]
It appears that BOOT (PB13) must be pulled low when the board is powered on or it will not be
detected by the STM32CubeProgrammer software.
[/quote]
As far as the AT program is concerned, it would be good if Seeed made the source code available, so you could restore it. That said, ST provides the source of an AT program as part of the STM23WL support package. It runs on their Nucleo board so you will have to make changes for the LoRa-E5.