[OnePlus 9 Pro] LovinVEVO:
Please find the steps to flash the ROM in a proper way. many thanks to dev @vishalcj17.9720197

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Microsoft Windows [Version 10.0.22000.348]

(c) Microsoft Corporation. All rights reserved.

C:\Platform_Tools_OP9P>adb devices

List of devices attached

5aa2556c device

C:\Platform_Tools_OP9P>adb reboot bootloader

C:\Platform_Tools_OP9P>fastboot oem unlock

< waiting for any device >

OKAY [ 0.035s]

Finished. Total time: 0.035s

C:\Platform_Tools_OP9P>adb reboot bootloader

C:\Platform_Tools_OP9P>fastboot -w

Erasing 'userdata' OKAY [ 0.696s]

F2FS-tools: mkfs.f2fs Ver: 1.14.0 (2020-08-24)

Info: Disable heap-based policy

Info: Debug level = 1

Info: Trim is disabled

Info: Set conf for android

Info: Segments per section = 1

Info: Sections per zone = 1

Info: sector size = 512

Info: total sectors = 464059800 (226591 MB)

Info: zone aligned segment0 blkaddr: 512

Info: add quota type = 0 => 4

Info: add quota type = 1 => 5

[f2fs_init_sit_area: 634] Filling sit area at offset 0x00600000

[f2fs_init_nat_area: 668] Filling nat area at offset 0x01a00000

[f2fs_write_root_inode:1281] Writing root inode (hot node), 2b200 0 200 at offset 0x00176640

[f2fs_write_default_quota:1357] Writing quota data, at offset 0002b801, 0002b802

[f2fs_write_qf_inode:1448] Writing quota inode (hot node), 2b200 0 200 at offset 0x00176641

[f2fs_write_default_quota:1357] Writing quota data, at offset 0002b803, 0002b804

[f2fs_write_qf_inode:1448] Writing quota inode (hot node), 2b200 0 200 at offset 0x00176642

[f2fs_update_nat_root:1502] Writing nat root, at offset 0x00001a00

[f2fs_add_default_dentry_root:1699] Writing default dentry root, at offset 0x0002b800

Info: Overprovision ratio = 0.420%

Info: Overprovision segments = 956 (GC reserved = 484)

[f2fs_write_check_point_pack: 827] Writing main segments, cp at offset 0x00000200

[f2fs_write_check_point_pack: 982] Writing Segment summary for HOT/WARM/COLD_DATA, at offset 0x00000201

[f2fs_write_check_point_pack:1009] Writing Segment summary for HOT_NODE, at offset 0x00000202

[f2fs_write_check_point_pack:1021] Writing Segment summary for WARM_NODE, at offset 0x00000203

[f2fs_write_check_point_pack:1032] Writing Segment summary for COLD_NODE, at offset 0x00000204

[f2fs_write_check_point_pack:1040] Writing cp page2, at offset 0x00000205

[f2fs_write_check_point_pack:1060] Writing NAT bits pages, at offset 0x000003fe

[f2fs_write_check_point_pack:1081] Writing cp page 1 of checkpoint pack 2, at offset 0x00000400

[f2fs_write_check_point_pack:1100] Writing cp page 2 of checkpoint pack 2, at offset 0x00000405

[f2fs_write_super_block:1133] Writing super block, at offset 0x00000000

Info: format successful

Sending 'userdata' (85 KB) OKAY [ 0.000s]

Writing 'userdata' OKAY [ 0.015s]

Erasing 'metadata' OKAY [ 4.360s]

Erase successful, but not automatically formatting.

File system type raw not supported.

Finished. Total time: 6.461s

C:\Platform_Tools_OP9P>fastboot update aospa-sapphire-2-oneplus9pro-alpha-20211213-img.zip

--------------------------------------------

Bootloader Version...:

Baseband Version.....:

Serial Number........: 5aa2556c

--------------------------------------------

extracting android-info.txt (0 MB) to RAM...

Checking 'product' OKAY [ 0.016s]

Setting current slot to 'a' OKAY [ 0.016s]

extracting boot.img (192 MB) to disk... took 0.593s

archive does not contain 'boot.sig'

Sending 'boot_a' (196608 KB) OKAY [ 4.292s]

Writing 'boot_a' OKAY [ 0.432s]

extracting dtbo.img (24 MB) to disk... took 0.047s

archive does not contain 'dtbo.sig'

Sending 'dtbo' (24576 KB) OKAY [ 0.548s]

Writing 'dtbo' OKAY [ 0.056s]

archive does not contain 'dt.img'

archive does not contain 'pvmfw.img'

archive does not contain 'recovery.img'

extracting vbmeta.img (0 MB) to disk... took 0.001s

archive does not contain 'vbmeta.sig'

Sending 'vbmeta' (8 KB) OKAY [ 0.001s]

Writing 'vbmeta' OKAY [ 0.002s]

extracting vbmeta_system.img (0 MB) to disk... took 0.001s

archive does not contain 'vbmeta_system.sig'

Sending 'vbmeta_system' (4 KB) OKAY [ 0.001s]

Writing 'vbmeta_system' OKAY [ 0.001s]

extracting vbmeta_vendor.img (0 MB) to disk... took 0.001s

archive does not contain 'vbmeta_vendor.sig'

Sending 'vbmeta_vendor' (4 KB) OKAY [ 0.001s]

Writing 'vbmeta_vendor' OKAY [ 0.002s]

extracting vendor_boot.img (192 MB) to disk... took 0.411s

archive does not contain 'vendor_boot.sig'

Sending 'vendor_boot' (196608 KB) OKAY [ 4.341s]

Writing 'vendor_boot' OKAY [ 0.438s]

extracting super_empty.img (0 MB) to disk... took 0.000s

Rebooting into fastboot OKAY [ 0.000s]

< waiting for any device >

Sending 'super' (4 KB) OKAY [ 0.000s]

Updating super partition OKAY [ 0.007s]

Resizing 'odm_a' OKAY [ 0.005s]

Resizing 'product_a' OKAY [ 0.005s]

Resizing 'system_a' OKAY [ 0.004s]

Resizing 'system_ext_a' OKAY [ 0.006s]

Resizing 'system_b' OKAY [ 0.005s]

Resizing 'vendor_a' OKAY [ 0.005s]

Resizing 'vendor_b' OKAY [ 0.004s]

archive does not contain 'boot_other.img'

extracting odm.img (2 MB) to disk... took 0.010s

archive does not contain 'odm.sig'

Resizing 'odm_a' OKAY [ 0.000s]

Sending 'odm_a' (2728 KB) OKAY [ 0.060s]

Writing 'odm_a' OKAY [ 0.081s]

archive does not contain 'odm_dlkm.img'

extracting product.img (1318 MB) to disk... took 12.519s

archive does not contain 'product.sig'

Resizing 'product_a' OKAY [ 0.000s]

Sending sparse 'product_a' 1/6 (262140 KB) OKAY [ 6.187s]

Writing 'product_a' OKAY [ 0.422s]

Sending sparse 'product_a' 2/6 (262140 KB) OKAY [ 6.150s]

Writing 'product_a' OKAY [ 0.422s]

Sending sparse 'product_a' 3/6 (262140 KB) OKAY [ 6.147s]

Writing 'product_a' OKAY [ 0.422s]

Sending sparse 'product_a' 4/6 (262140 KB) OKAY [ 6.147s]

Writing 'product_a' OKAY [ 0.428s]

Sending sparse 'product_a' 5/6 (262140 KB) OKAY [ 6.201s]

Writing 'product_a' OKAY [ 0.422s]

Sending sparse 'product_a' 6/6 (38976 KB) OKAY [ 0.928s]

Writing 'product_a' OKAY [ 0.141s]

extracting system.img (842 MB) to disk... took 4.620s

archive does not contain 'system.sig'

Resizing 'system_a' OKAY [ 0.016s]

Sending sparse 'system_a' 1/4 (262140 KB) OKAY [ 6.334s]

Writing 'system_a' OKAY [ 0.440s]

Sending sparse 'system_a' 2/4 (262140 KB) OKAY [ 6.030s]

Writing 'system_a' OKAY [ 0.408s]

Sending sparse 'system_a' 3/4 (262140 KB) OKAY [ 5.925s]

Writing 'system_a' OKAY [ 0.419s]

Sending sparse 'system_a' 4/4 (76112 KB) OKAY [ 1.711s]

Writing 'system_a' OKAY [ 0.187s]

extracting system_ext.img (463 MB) to disk... took 2.248s

archive does not contain 'system_ext.sig'

Resizing 'system_ext_a' OKAY [ 0.002s]

Sending sparse 'system_ext_a' 1/2 (262140 KB) OKAY [ 5.945s]

Writing 'system_ext_a' OKAY [ 0.407s]

Sending sparse 'system_ext_a' 2/2 (212732 KB) OKAY [ 4.890s]

Writing 'system_ext_a' OKAY [ 0.375s]

extracting system_other.img (17 MB) to disk... took 0.078s

archive does not contain 'system.sig'

Resizing 'system_b' OKAY [ 0.000s]

Sending 'system_b' (17852 KB) OKAY [ 0.406s]

Writing 'system_b' OKAY [ 0.094s]

extracting vendor.img (1218 MB) to disk... took 14.277s

archive does not contain 'vendor.sig'

Resizing 'vendor_a' OKAY [ 0.000s]

Sending sparse 'vendor_a' 1/5 (262140 KB) OKAY [ 6.211s]

Writing 'vendor_a' OKAY [ 0.407s]

Sending sparse 'vendor_a' 2/5 (262140 KB) OKAY [ 6.170s]

Writing 'vendor_a' OKAY [ 0.407s]

Sending sparse 'vendor_a' 3/5 (262140 KB) OKAY [ 6.164s]

Writing 'vendor_a' OKAY [ 0.422s]

Sending sparse 'vendor_a' 4/5 (262140 KB) OKAY [ 6.148s]

Writing 'vendor_a' OKAY [ 0.407s]

Sending sparse 'vendor_a' 5/5 (199356 KB) OKAY [ 4.711s]

Writing 'vendor_a' OKAY [ 0.344s]

archive does not contain 'vendor_dlkm.img'

archive does not contain 'vendor_other.img'

Rebooting OKAY [ 0.000s]

Finished. Total time: 157.411s

C:\Platform_Tools_OP9P>