Neufbox6 fails to install openwrt 23

Hello

I tried to install openwrt 23, but it fails.
Image used :
openwrt-23.05.3-bcm63xx-smp-sfr_neufbox-6-sercomm-r0-squashfs-cfe.bin

CPUI                                                                            
L1CI                                                                            
HELO                                                                            
CPUI                                                                            
L1CI                                                                            
DRAM                                                                            
----                                                                            
PHYS                                                                            
STRF                                                                            
400H                                                                            
PHYE                                                                            
DDR2                                                                            
SIZ4                                                                            
SIZ3                                                                            
SIZ2                                                                            
DINT                                                                            
USYN                                                                            
LSYN                                                                            
MFAS                                                                            
LMBE                                                                            
RACE                                                                            
PASS                                                                            
----                                                                            
ZBSS                                                                            
CODE                                                                            
DATA                                                                            
L12F                                                                            
MAIN                                                                            
NAN0                                                                            
BT01                                                                            
0001                                                                            
NAN9                                                                            
BT01                                                                            
0992                                                                            
NAN9                                                                            
NAN3                                                                            
RFS2                                                                            
NAN5                                                                            
                                                                                
                                                                                
CFE version 1.0.38-112.70 for BCM963268 (32bit,SP,BE)                           
Build Date: Fri Oct 18 19:11:22 CEST 2013 (gmu@gmu-thinkpad)                    
Copyright (C) 2000-2011 Broadcom Corporation.                                   
                                                                                
boot...                                                                         
NAND flash device: name ST NAND512W3A2CN6, id 0x2076 block 16KB size 65536KB    
RTL: chip 6000.1000 probed                                                      
TX/RX delay set on switch side!                                                 
Chip ID: BCM63168D0, MIPS: 400MHz, DDR: 400MHz, Bus: 200MHz                     
Main Thread: TP0                                                                
Memory Test Passed                                                              
Total Memory: 134217728 bytes (128MB)                                           
Boot Address: 0xb8000000                                                        
                                                                                
Board IP address                  : 192.168.22.22:ffffff00                      
Host IP address                   : 192.168.22.68                               
Gateway IP address                :                                             
Run from flash/host (f/h)         : f                                           
Default host run file name        : vmlinux                                     
Default host flash file name      : bcm963xx_fs_kernel                          
Boot delay (0-9 seconds)          : 1                                           
Boot image (0=latest, 1=previous) : 0                                           
Board Id (0-13)                   : NB6V-SER-r0                                 
Number of MAC Addresses (1-32)    : 11                                          
Base MAC Address                  : 24:95:04:e7:05:e8                           
PSI Size (1-64) KBytes            : 24                                          
Enable Backup PSI [0|1]           : 0                                           
System Log Size (0-256) KBytes    : 0                                           
Main Thread Number [0|1]          : 0                                           
                                                                                
*** Press any key to stop auto run (1 seconds) ***                              
Auto run second count down: 1                                                   
CFE> r openwrt.bin                                                              
Loading 192.168.22.68:openwrt.bin ...                                           
Finished loading 5505028 bytes                                                  
Try upgrade firmware....                                                        
WFI TAG :                                                                       
        wfiVersion : 0x0                                                        
        wfiChipId : 0x0                                                         
        wfiFlashType : 0x0                                                      
        wfiCrc : 0x00000000                                                     
        wfiReserved : -559038242                                                
Illegal whole flash image                                                       
Retry loading it as a compressed image.                                         
Code Address: 0x36000000, Entry Address: 0x42726f61                             
LZMA: Prossible old LZMA format, trying to decompress..  

and then, nothing happens : if I reboot the device, it's immediately going back to manufacturer's one.
Any help? thank you

Is this also your thread?

I would understand lot of geeks or nerds wanting to solve this issue with this device. It's a very sold one here and nowadays it's a very clever idea to use it with openwrt. But it doesnt works?