Return code 253 on iPad Air 4,1

[renfengyi19]

Vieux - A tool for 32/64 Bit OTA downgrades

Current version is: 1.0.1
If you are using a 64 Bit device then connect it in DFU Mode
If you are using a 32 Bit device then just have it connected in NORMAL mode
Files cleaned.
/Users/zst/Downloads/iPad_64bit_10.3.3_14G60_Restore.ipsw is a zip archive!
Starting IPSW unzipping
Continuing...
IPSW found at given path...
Cleaning up old files...
Files cleaned.
Unzipping..
Found: CPID:8960 CPRV:11 CPFM:03 SCEP:01 BDID:10 ECID:000003372FC4F114 IBFL:1C SRTG:[iBoot-1704.10] PWND:[checkm8]
Device is already in pwned DFU Mode. Not executing exploit.
Exploit worked!
*** SecureROM Signature check remover by Linus Henze ***
Applying patches...
Patches have already been applied. Exiting.

Starting iBSS/iBEC patching
Looks like you are downgrading an iPad Air to 10.3.3!
Patched iBSS/iBEC
About to re-build IPSW
Entering PWNREC mode...
Getting SHSH...
Restoring...
Note that errors about 'BbSkeyId', 'FDR Client', 'BasebandFirmware Node' and 'ERROR: zip_name_locate: Firmware/all_flash/manifest' are not important.
Just ignore them and only report errors that actually stop the restore.
Restoring without a baseband as your iPad4,1 doesn't have cellular capabilities...
WARNING: Unable to find BbChipID node
Version: 81b98e0425e17250cc83d5badaf9a8cc6399f481 - 245
Libipatcher version: 3159a387584e352f690cca859e013c3a4683f3e8 - 69
Odysseus support: yes
[INFO] 64-bit device detected
futurerestore init done
reading signing ticket resources/other/apnonce.shsh is done
Found device iPad4,1 j71ap
[TSSC] opening resources/manifests/BuildManifest_iPad4,1.plist
[TSSR] User specified not to request a baseband ticket.
Request URL set to https://gs.apple.com/TSS/controller?action=2
Sending TSS request attempt 1... response successfully received

WARNING: user specified not to flash a baseband. This can make the restore fail if the device needs a baseband!
if you added this flag by mistake you can press CTRL-C now to cancel
continuing restore in 10 9 8 7 6 5 4 3 2 1
Found device in DFU mode
[Error] unsupported device mode, please put device in recovery mode or normal mode
[Error] Fail code=-3
Failed with errorcode=-3

ERROR..
Return code: 253
Restore Failed.
Please try again and report the error + full logs if it persists.
Exiting...

Could you please help me solve this? Thank you so much.