Flashing modified firmware to E5788: "! Error closing section 9 (System) - error code 0c"

[49b]

Hi, I have a E5788u-96c and I am trying to modify the firmware (specifically, modifying the system section) and then flash it. When I try to flash the firmware modified by qhuaweiflash, using balong_flash after saving the modified firmware, I get an error saying this:

! Error closing section 9 (System) - error code 0c

Here is the full thing:

sudo ./balong_flash -f e5788-fw-modified.BIN 
[sudo] password for user: 
--------------------------------------------------------------------------------------------------
--------------------------------------------------------------------------------------------------

 Firmware File Code: b (FW_ISO)
                                 
 Digital signature: 4014 bytes
 Hash public key: 44C7B100763BF828B13B8B6AECF1ED2A6D3CB2888998F41448B276207B0F4EC4
 Firmware version: 11.450.09.02.1217
 Platform:       M9650UE__1
 Build Date:     2017.12.28 15:55:04
 Header: version 1, match code: HWEW11.1
 Digital Signature Mode: FW_ISO (4014 bytes)
 Protocol Version: 7200B--SKCBADZM
 Device ID: HUAWEI M9650UE__1
----------------------------------------------------

##  ---- Section name --- recorded

00  Fastboot              100%
01  M3Boot-ptable         100%
02  M3Boot                100%
03  M3Image               100%
04  VxWorks               100%
05  Kernel_R11            100%
06  Oeminfo               100%
07  U00390000             100%
08  Logo                  100%
09  System                100%
! Error closing section 9 (System) - error code 0c