If you can boot to grub2, then it has worked.
The grub.cfg may be wrong for working from the 2nd partition.
Please copy this text: 5460efc97de3
Recommended for Easy2Boot (fastest!) - SanDisk Extreme SDCZ880-128G-G46
130+ Tutorials on USB booting.
Copyright (c)2018 Easy2Boot
Please donate to support this site