Flashed MR6450 formware to MR6400

[Maplewood]

I have an MR6400-1DNNAS and I was having some issues locking bands and other issues with it often dropping to LTE or Roaming, so I tried flashing the firmware MR6450-100EUS_23115597_NTGX65_10.04.25.00_00_Generic_00.34_00.secc.cwe. It seemed to work, and I was able to boot up and telnet to 5510. I enabled full telnet on port 23 and I could connect to that fine. I did the settings to block firmware updates and the TTL Mangle. Then I put my SIM back into it. I get the first NETGEAR logo, then the 5G logo, then the animated NETGEAR logo, and the second 5G logo, then the screen goes blank and the device never responds. If I pull the battery and the SIM, it will boot fine. I can still telnet and everything. I enabled airplane mode, reinstalled the SIM and it again boots fine. I can telnet and access all the screens I want. If I turn off airplane more, I get the changes saved message. After tapping OK, the screen goes blank, and the device again is unresponsive.

I tried to revert back to the original firmware. I can get the device into the Software Download screen and plug in the USB cable. Here is what I get from FDT.

C:\Temp>.\fdt.exe -f .\MR6400-1DNNAS_23115595_NTGX65_10.04.11.00_00_Dish_02.06_00.secc.cwe
FDT version: 4.6.2.0
Checking modem mode ...

Firmware download failed.
Primary error code: 82 - Failed in checking modem mode.
Secondary error code: 66 - Failed in initializing comport.
Total time elapsed: 11641 ms.
Press Enter to continue ...

Any idea how to recover this device?

[Maplewood]

Update: it appears uninstalling the device in Windows device manager and scanning for changes so that it reinstalled the driver fixed my issue. I was able to flash back to the original firmware.

[ZzzzShinzzzZ]

well done. Have you gotten all the 5g bands of 6450 on your 6400?I mean band n78

[Maplewood]

well done. Have you gotten all the 5g bands of 6450 on your 6400?I mean band n78

I don't see n78. Here is the output of a bunch of the AT commands.

ati
Manufacturer: Netgear, Incorporated
Model: MR6400
Revision: NTGX65_10.04.11.00 r9072 ntgrbc-fwbuild7.netgear.com 2022/09/17 00:26: 01
IMEI: ***************
IMEI SV: 5
FSN: 71Y329W3A02B8
+GCAP: +CGSM


OK
at!gstatus
at!gstatus

Current Time: 1472 Mode: Online
System Mode: NR5G N25 PS State: 5GSUB6
Tx Power (dBm): -50
TxGMM (PS) State: REGISTERED NORMAL SERVICE

OK
at!band=?
at!band=?
Index, Name, GW_Mask LTE_1-64 LTE_65-128 NR5G_1-64 NR5G_65-128 NR5G_257-320
00, All, 0000000000000000 0000A1003300385F 0000000000000042 0000810031002812 0000000000001042 0000000000000000
02, LTE Only, 0000000000000000 0000010000000045 0000000000000000 0000000000000000 0000000000000000 0000000000000000
03, LTE and 5G NR, 0000000000000000 0000010000000045 0000000000000000 0000010000000010 0000000000001040 0000000000000000
04, 5G NR Only, 0000000000000000 0000000000000000 0000000000000000 0000010000000010 0000000000001040 0000000000000000

0000800000000000 - LTE B48
0000200000000000 - LTE B46
0000010000000000 - LTE B41
0000000020000000 - LTE B30
0000000010000000 - LTE B29
0000000002000000 - LTE B26
0000000001000000 - LTE B25
0000000000002000 - LTE B14
0000000000001000 - LTE B13
0000000000000800 - LTE B12
0000000000000040 - LTE B7
0000000000000010 - LTE B5
0000000000000008 - LTE B4
0000000000000004 - LTE B3
0000000000000002 - LTE B2
0000000000000001 - LTE B1
0000000000000040 - LTE B71
0000000000000002 - LTE B66
0000800000000000 - NR5G N48
0000010000000000 - NR5G N41
0000000020000000 - NR5G N30
0000000010000000 - NR5G N29
0000000001000000 - NR5G N25
0000000000002000 - NR5G N14
0000000000000800 - NR5G N12
0000000000000010 - NR5G N5
0000000000000002 - NR5G N2
0000000000001000 - NR5G N77
0000000000000040 - NR5G N71
0000000000000002 - NR5G N66
0000000000000008 - NR5G N260

OK

[Maplewood]

I switched to the 5G NR only and it connected to T-Mobile with really decent speeds. Check out this speed test.

https://imgur.com/a/XQfDBzE

I'm very happy with the speed and latency.