Your post inspired me to try different flash dumps.
First I tried an older version SCOMFGS202110. Its length is 0x1b77a0 and checksum 0x82bda605
ROM: V1.1.4
ROM: CFG 0x00000006
ROM: SFLASH-4
hw fuse format 1
U-Boot 2011.12-lantiq-gpon-1.2.20.1-svn20 (Aug 10 2015 - 13:49:58), Build: falcon_sfp
Board: SFP
DRAM: internal: 1 MiB
Now running in RAM - U-Boot at: 9f2c4000
SF: Detected MX25L6405D with page size 64 KiB, total 8 MiB
Chip: FALCON-SR (A22)
Bootmode: 0x06
Reset cause: Power-On Reset
CPU Clock: 400 MHz
Done!
Net: SGMII, SERDES [PRIME]
Type run flash_nfs to mount root filesystem over NFS
SF: Detected MX25L6405D with page size 64 KiB, total 8 MiB
SF: Detected MX25L6405D with page size 64 KiB, total 8 MiB
SF: Detected MX25L6405D with page size 64 KiB, total 8 MiB
active_img 0, committed_img 1
pid_addr 0x2b77a0
dbSign Addr: 0x9f200208
imgNum: 1
img 0: start addr: 0x100000, length: 0x1b77a0
checksum: 0x82bda605
crc32 result: 0x82bda605
check sum OK
name c_img
value 1
name activate_image
value 0
Erasing SPI flash...Writing to SPI flash...done
SF: Detected MX25L6405D with page size 64 KiB, total 8 MiB
***************************************************
Sercomm Boot Version 2.0.2.0
***************************************************
No sc dl flag.
gpio_id:8 no found
Entering Firmware : Everything is OK.
No sc dl flag.
## Starting application at 0x10000000 ...
Overall used memory: 199488
Available packet buffer: 704448 (llt min 7425, llt max 18432)
Init flash support
M25PXX : Init device 'Macronix 64 Mbit' with JEDEC ID 0xC22017/0x0000.
Found flash at 0x00000000-0x007fffff
Flash bank with 128 sectors, sector size is 65536 bytes
Find valid uboot environment in env_off and env_end_off
Machine: Falcon SFP Stick (SFP)
Set image#0 version: SCOMFGS202110
Set image#1 version: SCOMFGS202110
Successfully stored environment to 0x7f0000
Successfully stored environment to 0x60000
Image start address: 0xb0100000
Image 0: 0xB0100000 - valid
Image 1: 0xB0480000 - valid
ONT Boot up #1 image
FALC(tm) ON Optic Driver, version 7.4.0.0 (c) Copyright 2015, Lantiq Beteiligungs-GmbH & Co. KG
FALC(tm) ON Base Driver, Version 7.3.3.0 (c) Copyright 2015, Lantiq Beteiligungs-GmbH & Co. KG
next, I tried the "virgin" dump. My setup don't have ethernet connected thus the output is not complete.
ROM: V1.1.4
ROM: CFG 0x00000006
ROM: SFLASH-4
hw fuse format 1
U-Boot 2011.12-lantiq-gpon-1.2.20.1-svn20 (Aug 10 2015 - 13:49:58), Build: falcon_sfp
Board: SFP
DRAM: internal: 1 MiB
Now running in RAM - U-Boot at: 9f2c4000
SF: Detected MX25L6405D with page size 64 KiB, total 8 MiB
Chip: FALCON-SR (A22)
Bootmode: 0x06
Reset cause: Power-On Reset
CPU Clock: 400 MHz
Done!
Net: SGMII, SERDES [PRIME]
Type run flash_nfs to mount root filesystem over NFS
SF: Detected MX25L6405D with page size 64 KiB, total 8 MiB
SF: Detected MX25L6405D with page size 64 KiB, total 8 MiB
SF: Detected MX25L6405D with page size 64 KiB, total 8 MiB
active_img 0, committed_img 1
pid_addr 0x2a0ce8
dbSign Addr: 0x9f200208
imgNum: 1
img 0: start addr: 0x100000, length: 0x1a0ce8
checksum: 0xa39a73eb
crc32 result: 0x856d1025
check sum error
try run another image.
pid_addr 0x620ce8
dbSign Addr: 0x9f200208
imgNum: 1
img 0: start addr: 0x480000, length: 0x1a0ce8
checksum: 0xa39a73eb
crc32 result: 0xd7cc6721
check sum error
Enter download mode, two image all error
DEBUG_INF:===================================================
DEBUG_INF:Sercomm Upgrade(Module Ver 2.14.02.24) Start!
DEBUG_INF:===================================================
SF: Detected MX25L6405D with page size 64 KiB, total 8 MiB
0x0000: 00 c0 02 12 35 88
Error: SGMII TBI not in sync!
Error: SGMII TBI not in sync!
Error: SGMII TBI not in sync!
Error: SGMII TBI not in sync!
Error: SGMII TBI not in sync!
Error: SGMII TBI not in sync!
Lastly, the regular Orange dump from the top of this page. My module serial number has changed. Opened the image in the editor to modify serial number, MAC address, date code at the offset 0x50000. Reflashed the module. It did not take my changes. Values defaulted to: sn: SCOM00000118 MAC: 00:CO:02:12:35:89 date: 150707