=> Bootstrap dependency digest>=20010302: found digest-20190127
=> Fetching micropython-1.9.2.tar.xz
=> Total size: 6699860 bytes
ftp: Error retrieving file `503 Backend unavailable, connection failed'
fetch: Unable to fetch expected file micropython-1.9.2.tar.xz
=> Checksum SHA1 OK for micropython-1.9.2/micropython-1.9.2.tar.xz
=> Checksum RMD160 OK for micropython-1.9.2/micropython-1.9.2.tar.xz
=> Checksum SHA512 OK for micropython-1.9.2/micropython-1.9.2.tar.xz