[Android Software Development] Blue_Monk:
HI there. I'm having some trouble with installing this. Log below.

Steps:

-installed TWRP -> Format Data -> reboot to recovery

-ADB load zip ->TWRP install zip -> error "Unable to decrypt FBE" and the stuff below.

No magisk or anything. Just twrp and this zip.

OnePlus 9 Pro OOS11.2.9.9

Installing zip file '/sdcard/Disable_Dm-Verity_ForceEncrypt_11.02.2020.zip'
I:Update binary zip
Verifying package compatibility...
Package doesn't contain compatibility.zip entry
I:Extracting updater binary 'META-INF/com/google/android/update-binary'
I:Zip does not contain SELinux file_contexts file in its root.

Archive: /sdcard/Disable_Dm-Verity_ForceEncrypt_11.02.2020.zip
inflating: tools/arm/magiskpolicy
inflating: tools/avb/verity.x509.pem
inflating: tools/x86/futility
inflating: META-INF/com/google/android/updater-script
inflating: META-INF/com/google/android/update-binary
inflating: tools/util_functions.sh
inflating: tools/chromeos/kernel.keyblock
inflating: tools/arm/futility
inflating: README.md
inflating: tools/chromeos/kernel_data_key.vbprivk
inflating: tools/ak3-core.sh
inflating: tools/arm/magiskboot
inflating: anykernel.sh
inflating: tools/boot_signer-dexed.jar
inflating: tools/arm/keycheck
inflating: tools/x86/magiskboot
inflating: tools/x86/busybox
inflating: tools/x86/keycheck
inflating: tools/arm/busybox
inflating: banner
inflating: tools/x86/magiskpolicy
inflating: tools/avb/verity.pk8
"*************************************************"
"* DmVerity,ForceEncrypt, and DiscQuota Disabler *"
"* By: Zackptg5 *"
"* Heavily based on the work of: *"
"* TopJohnWu and Jcadduono *"
"*************************************************"

AnyKernel3 by osm0sis @ xda-developers

Installing...
/dev/block/by-name/boot_b

- Chosen/Default Arguments:
Keep ForceEncrypt: false
Keep Dm-Verity: false
Keep Disc Quota: true

- Detecting Root Method...
No Magisk or SuperSu detected!
- Unpacking boot img...
192+0 records in
192+0 records out
201326592 bytes (192.0MB) copied, 0.211559 seconds, 907.5MB/s
Parsing boot image: [/tmp/anykernel/boot.img]
HEADER_VER [0]
KERNEL_SZ [43962880]
RAMDISK_SZ [369099097]
SECOND_SZ [0]
EXTRA_SZ [3]
PAGESIZE [0]
NAME []
CMDLINE []
CHECKSUM [0000000000000000000000000000000000000000000000000000000000000000]
Floating point exception
- Creating .magisk and .supersu files...
- Patching fstabs:
/vendor/etc/fstab.qcom
sed: can't create temp file '/vendor/etc/fstab.qcom2EQI4K': Read-only file system
sed: can't create temp file '/vendor/etc/fstab.qcomWbnVBw': Read-only file system
/vendor/etc/fstab_nodata.qcom
sed: can't create temp file '/vendor/etc/fstab_nodata.qcomKofqWI': Read-only file system
sed: can't create temp file '/vendor/etc/fstab_nodata.qcomChTQvG': Read-only file system
- Repacking boot img...
Parsing boot image: [/tmp/anykernel/boot.img]
HEADER_VER [0]
KERNEL_SZ [43962880]
RAMDISK_SZ [369099097]
SECOND_SZ [0]
EXTRA_SZ [3]
PAGESIZE [0]
NAME []
CMDLINE []
CHECKSUM [0000000000000000000000000000000000000000000000000000000000000000]
Floating point exception

Repacking image failed. Aborting...
Updater process ended with ERROR: 1
I:Install took 6 second(s).
Error installing zip file '/sdcard/Disable_Dm-Verity_ForceEncrypt_11.02.2020.zip'
Updating partition details...
I:checking for twrp app
I:Data backup size is 0MB, free: 223987MB.
...done
I:Set page: 'flash_done'
I:operation_end - status=1
I:Set page: 'clear_vars'
I:Set page: 'main2'
I:Set page: 'advanced'
I:Set page: 'copylog'
I:Set page: 'action_page'
I:operation_start: 'Copy Log'
I:Copied file /tmp/recovery.log to /data/media/recovery.log