auxor@test3:~/Downloads$ parted iot_rpi3.img
WARNING: You are not superuser. Watch out for permissions.
GNU Parted 2.3
Using /home/auxor/Downloads/iot_rpi3.img
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted) u
Unit? [compact]? B
(parted) print
Model: (file)
Disk /home/auxor/Downloads/iot_rpi3.img: 4563402752B
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Number Start End Size File system Name Flags
1 20480B 67129343B 67108864B fat16 rpiboot
2 67129344B 68177919B 1048576B uboot_a
3 68177920B 69226495B 1048576B uboot_b
4 69226496B 102780927B 33554432B boot_a
5 102780928B 136335359B 33554432B boot_b
6 136335360B 673206271B 536870912B ext4 system_a
7 673206272B 1210077183B 536870912B system_b
8 1210077184B 1210142719B 65536B vbmeta_a
9 1210142720B 1210208255B 65536B vbmeta_b
10 1210208256B 1211256831B 1048576B misc
11 1211256832B 1278365695B 67108864B ext4 vendor_a
12 1278365696B 1345474559B 67108864B vendor_b
13 1345474560B 1588744191B 243269632B ext4 oem_a
14 1588744192B 1832013823B 243269632B oem_b
15 1832013824B 1836208127B 4194304B oem_bootloader_a
16 1836208128B 1840402431B 4194304B oem_bootloader_b
17 1840402432B 1873956863B 33554432B factory
18 1873956864B 1890734079B 16777216B factory_bootloader
19 1890734080B 4563378175B 2672644096B userdata
20 4563378176B 4563382271B 4096B gapps
sudo mount -o loop,offset=136335360 iot_rpi3.img /tmp/iot