[SOLVED] Broken library function in FlashEEPROM

Works fine for me on a Pico with 1v85...

>f.read(1)
=undefined
>f.write(1, "hello")
=undefined
>f.read(1)
=new Uint8Array([104, 101, 108, 108, 111])
>0x076000
=483328

edit: moving this to ESP8266 - as this is not an issue with Espruino boards.