Command (? for help): i
Partition number (1-7): 1
Partition GUID code: C12A7328-F81F-11D2-BA4B-00A0C93EC93B (EFI System)
Partition unique GUID: 57DA3874-BAD6-4C30-90C6-F7B894246615
First sector: 34 (at 17.0 KiB)
Last sector: 534527 (at 261.0 MiB)
Partition size: 534494 sectors (261.0 MiB)
Attribute flags: 0000000000000000
Partition name: ''

Command (? for help): t
Partition number (1-7): 1
Current type is 'EFI System'
Hex code or GUID (L to show codes, Enter = 8300): CA7D7CCB-63ED-4C53-861C-1742536059CC
Changed type of partition to 'Unknown'

Command (? for help): i
Partition number (1-7): 1
Partition GUID code: CA7D7CCB-63ED-4C53-861C-1742536059CC (Unknown)
Partition unique GUID: 57DA3874-BAD6-4C30-90C6-F7B894246615
First sector: 34 (at 17.0 KiB)
Last sector: 534527 (at 261.0 MiB)
Partition size: 534494 sectors (261.0 MiB)
Attribute flags: 0000000000000000
Partition name: ''