[Xiaomi Mi A1 Guides, News, & Discussion] 90180360:
I used MiFlash to flash tissot-F-OPM1.171019.026.V9.6.4.0.ODHMIFE and now it seems to be stuck in a boot loop.

Edit: Using fastboot there's an "Invalid sparse file format at header magic" error / warning.

Edit: The log, if anyone cares:

c:\tissot-F-OPM1.171019.026.V9.6.4.0.ODHMIFE>flash_all_clean.bat
Sending 'sbl1' (384 KB) OKAY [ 0.034s]
Writing 'sbl1' OKAY [ 0.031s]
Finished. Total time: 0.101s
Sending 'sbl1bak' (384 KB) OKAY [ 0.032s]
Writing 'sbl1bak' OKAY [ 0.016s]
Finished. Total time: 0.104s
Sending 'rpm' (172 KB) OKAY [ 0.044s]
Writing 'rpm' OKAY [ 0.016s]
Finished. Total time: 0.099s
Sending 'rpmbak' (172 KB) OKAY [ 0.047s]
Writing 'rpmbak' OKAY [ 0.016s]
Finished. Total time: 0.094s
Sending 'tz' (1524 KB) OKAY [ 0.062s]
Writing 'tz' OKAY [ 0.016s]
Finished. Total time: 0.125s
Sending 'tzbak' (1524 KB) OKAY [ 0.063s]
Writing 'tzbak' OKAY [ 0.041s]
Finished. Total time: 0.135s
Sending 'devcfg' (40 KB) OKAY [ 0.031s]
Writing 'devcfg' OKAY [ -0.000s]
Finished. Total time: 0.082s
Sending 'devcfgbak' (40 KB) OKAY [ 0.031s]
Writing 'devcfgbak' OKAY [ 0.016s]
Finished. Total time: 0.109s
Sending 'dsp' (16384 KB) OKAY [ 0.423s]
Writing 'dsp' OKAY [ 0.094s]
Finished. Total time: 0.534s
Sending 'aboot' (584 KB) OKAY [ 0.047s]
Writing 'aboot' OKAY [ 0.016s]
Finished. Total time: 0.115s
Sending 'abootbak' (584 KB) OKAY [ 0.047s]
Writing 'abootbak' OKAY [ 0.032s]
Finished. Total time: 0.126s
Sending 'lksecapp' (60 KB) OKAY [ 0.047s]
Writing 'lksecapp' OKAY [ 0.015s]
Finished. Total time: 0.078s
Sending 'lksecappbak' (60 KB) OKAY [ 0.031s]
Writing 'lksecappbak' OKAY [ 0.031s]
Finished. Total time: 0.109s
Sending 'cmnlib' (204 KB) OKAY [ 0.032s]
Writing 'cmnlib' OKAY [ 0.031s]
Finished. Total time: 0.094s
Sending 'cmnlibbak' (204 KB) OKAY [ 0.031s]
Writing 'cmnlibbak' OKAY [ 0.031s]
Finished. Total time: 0.100s
Sending 'cmnlib64' (256 KB) OKAY [ 0.031s]
Writing 'cmnlib64' OKAY [ 0.016s]
Finished. Total time: 0.094s
Sending 'cmnlib64bak' (256 KB) OKAY [ 0.031s]
Writing 'cmnlib64bak' OKAY [ 0.031s]
Finished. Total time: 0.114s
Sending 'keymaster' (224 KB) OKAY [ 0.047s]
Writing 'keymaster' OKAY [ 0.031s]
Finished. Total time: 0.101s
Sending 'keymasterbak' (224 KB) OKAY [ 0.031s]
Writing 'keymasterbak' OKAY [ 0.016s]
Finished. Total time: 0.094s
Sending 'boot_a' (14888 KB) OKAY [ 0.368s]
Writing 'boot_a' OKAY [ 0.081s]
Finished. Total time: 0.495s
Sending 'boot_b' (14888 KB) OKAY [ 0.367s]
Writing 'boot_b' OKAY [ 0.094s]
Finished. Total time: 0.523s
Sending 'modem_a' (86016 KB) OKAY [ 2.049s]
Writing 'modem_a' OKAY [ 0.400s]
Finished. Total time: 2.481s
Sending 'modem_b' (86016 KB) OKAY [ 2.031s]
Writing 'modem_b' OKAY [ 0.405s]
Finished. Total time: 2.483s
Invalid sparse file format at header magic
Sending sparse 'system_a' 1/6 (514999 KB) OKAY [ 12.308s]
Writing sparse 'system_a' 1/6 OKAY [ 3.148s]
Sending sparse 'system_a' 2/6 (509963 KB) OKAY [ 12.671s]
Writing sparse 'system_a' 2/6 OKAY [ 3.313s]
Sending sparse 'system_a' 3/6 (522181 KB) OKAY [ 12.983s]
Writing sparse 'system_a' 3/6 OKAY [ 12.348s]
Sending sparse 'system_a' 4/6 (518015 KB) OKAY [ 12.977s]
Writing sparse 'system_a' 4/6 OKAY [ 4.634s]
Sending sparse 'system_a' 5/6 (520654 KB) OKAY [ 12.666s]
Writing sparse 'system_a' 5/6 OKAY [ 3.487s]
Sending sparse 'system_a' 6/6 (282180 KB) OKAY [ 6.902s]
Writing sparse 'system_a' 6/6 OKAY [ 4.542s]
Finished. Total time: 111.323s
Invalid sparse file format at header magic
Sending sparse 'system_b' 1/6 (514999 KB) OKAY [ 12.572s]
Writing sparse 'system_b' 1/6 OKAY [ 3.191s]
Sending sparse 'system_b' 2/6 (509963 KB) OKAY [ 12.203s]
Writing sparse 'system_b' 2/6 OKAY [ 3.321s]
Sending sparse 'system_b' 3/6 (522181 KB) OKAY [ 13.109s]
Writing sparse 'system_b' 3/6 OKAY [ 12.151s]
Sending sparse 'system_b' 4/6 (518015 KB) OKAY [ 13.104s]
Writing sparse 'system_b' 4/6 OKAY [ 4.684s]
Sending sparse 'system_b' 5/6 (520654 KB) OKAY [ 12.676s]
Writing sparse 'system_b' 5/6 OKAY [ 3.478s]
Sending sparse 'system_b' 6/6 (282180 KB) OKAY [ 6.763s]
Writing sparse 'system_b' 6/6 OKAY [ 4.447s]
Finished. Total time: 134.675s
Setting current slot to 'a' OKAY [ 0.021s]
Finished. Total time: 0.030s
mke2fs 1.43.3 (04-Sep-2016)
Creating filesystem with 13449081 4k blocks and 3366912 inodes
Filesystem UUID: 732aae82-89b3-11e8-8239-3902361134e6
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
4096000, 7962624, 11239424

Allocating group tables: done
Writing inode tables: done
Creating journal (65536 blocks): done
Writing superblocks and filesystem accounting information: done

Erasing 'userdata' OKAY [ 0.568s]
Sending 'userdata' (4493 KB) OKAY [ 0.126s]
Writing 'userdata' OKAY [ 0.047s]
Finished. Total time: 1.220s
Rebooting
Finished. Total time: 0.016s
Press any key to exit...