[tomay@tomay-pc 2020-08-23--03-21-01]$ fastboot -w && fastboot erase system && fastboot flash recovery recovery.emmc.win && fastboot flash boot boot.emmc.win && fastboot flash vbmeta vbmeta.emmc.win && fastboot flash dtbo dtbo.emmc.win && fastboot flash system system_image.emmc.win && fastboot reboot
Erasing 'userdata'                                 OKAY [ 42.704s]
mke2fs 1.45.4 (23-Sep-2019)
Creating filesystem with 13704947 4k blocks and 3432448 inodes
Filesystem UUID: 27056472-9f24-41e5-80e0-7a2c06b5a065
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   

Sending 'userdata' (4669 KB)                       OKAY [  0.150s]
Writing 'userdata'                                 OKAY [  0.001s]
Erasing 'cache'                                    OKAY [ 42.260s]
mke2fs 1.45.4 (23-Sep-2019)
Creating filesystem with 65536 4k blocks and 65536 inodes
Filesystem UUID: eab70d3d-d05c-4bbf-b331-96148b001142
Superblock backups stored on blocks: 
        32768

Allocating group tables: done                            
Writing inode tables: done                            
Creating journal (4096 blocks): done
Writing superblocks and filesystem accounting information: done

Sending 'cache' (184 KB)                           OKAY [  0.008s]
Writing 'cache'                                    OKAY [  0.003s]
Finished. Total time: 85.289s
******** Did you mean to fastboot format this ext4 partition?
Erasing 'system'                                   OKAY [ 41.153s]
Finished. Total time: 41.157s
Sending 'recovery' (65536 KB)                      OKAY [  2.066s]
Writing 'recovery'                                 OKAY [  0.398s]
Finished. Total time: 2.468s
Sending 'boot' (65536 KB)                          OKAY [  2.056s]
Writing 'boot'                                     OKAY [  0.405s]
Finished. Total time: 2.466s
Sending 'vbmeta' (64 KB)                           OKAY [  0.005s]
Writing 'vbmeta'                                   OKAY [  0.001s]
Finished. Total time: 0.011s
Sending 'dtbo' (24576 KB)                          OKAY [  0.779s]
Writing 'dtbo'                                     OKAY [  0.150s]
Finished. Total time: 0.933s
Invalid sparse file format at header magic
Sending sparse 'system' 1/6 (772446 KB)            OKAY [ 25.536s]
Writing 'system'                                   OKAY [  0.000s]
Sending sparse 'system' 2/6 (771281 KB)            OKAY [ 25.769s]
Writing 'system'                                   OKAY [  0.000s]
Sending sparse 'system' 3/6 (780089 KB)            OKAY [ 25.509s]
Writing 'system'                                   OKAY [  0.000s]
Sending sparse 'system' 4/6 (753320 KB)            OKAY [ 24.029s]
Writing 'system'                                   OKAY [  0.000s]
Sending sparse 'system' 5/6 (770800 KB)            OKAY [ 24.569s]
Writing 'system'                                   OKAY [  0.000s]
Sending sparse 'system' 6/6 (221122 KB)            OKAY [  7.229s]
Writing 'system'                                   OKAY [  0.000s]
Finished. Total time: 183.725s
Rebooting                                          OKAY [ 12.844s]
Finished. Total time: 12.945s