Boot2Qt NVIDIA Jetson TX2 board flasher don't work

Steps to Reproduce

• Set NVIDIA Jetson TX2 in recovery mode
• Try to flash latest boot2qt 6.4 Jetson TX2 with guide of https://doc.qt.io/Boot2Qt/b2qt-preparing-hardware-jetsontx2.html#flashing-linux-for-tegra-r32-6-1-onto-the-system-s-internal-emmc

Observed result:

• ./doflash.sh fails with reason

  Welcome to Tegra Flash
  version 1.0.0
  Type ? or help for help and q or quit to exit
  Use ! to execute system commands
  [   0.0018 ] Generating RCM messages
  [   0.0036 ] tegrarcm_v2 --listrcm rcm_list.xml --chip 0x18 0 --download rcm mb1_recovery_prod.bin 0 0
  [   0.0042 ] RCM 0 is saved as rcm_0.rcm
  [   0.0044 ] RCM 1 is saved as rcm_1.rcm
  [   0.0044 ] List of rcm files are saved in rcm_list.xml
  [   0.0044 ] 
  [   0.0044 ] Signing RCM messages
  [   0.0063 ] tegrasign_v3.py --key None --list rcm_list.xml --pubkeyhash pub_key.key
  [   0.0064 ] Assuming zero filled SBK key
  [   0.0111 ] Copying signature to RCM mesages
  [   0.0128 ] tegrarcm_v2 --chip 0x18 0 --updatesig rcm_list_signed.xml
  [   0.0136 ] 
  [   0.0136 ] Boot Rom communication
  [   0.0157 ] tegrarcm_v2 --chip 0x18 0 --rcm rcm_list_signed.xml --skipuid
  [   0.0166 ] RCM version 0X180001
  [   0.0467 ] Boot Rom communication completed
  [   1.0557 ] 
  [   2.0602 ] tegrarcm_v2 --isapplet
  [   2.0621 ] Applet version 01.00.0000
  [   2.0959 ] 
  [   2.0993 ] Retrieving EEPROM data
  [   2.0995 ] tegrarcm_v2 --oem platformdetails eeprom cvm ./tegraflash/cvm.bin.gH2yG
  [   2.1007 ] Applet version 01.00.0000
  [   2.1478 ] Saved platform info in ./tegraflash/cvm.bin.gH2yG
  [   2.2276 ] 
  size of b2qt-embedded-qt6-image.ext4 is not mulple of 1048576.
  

• More exactly failing command behind is:

./tegraflash/mksparse -b 1048576 --fillpattern=0 b2qt-embedded-qt6-image.ext4 b2qt-embedded-qt6-image.ext4.img