LG SN11RG soundbar problems : "rear bass" + "muffled Dolby Atmos"

[MARCH 2022 UPDATE] : beginning March 2022, LG deployed an OTA firmware update (Main 2202222 / Micom 2110221 and then 2202091 / Chrome Cast 1.52.27.2222). People seem generally happy with this update. I&still not :) Muffled ATMOS is still there and we are miles away of ATMOS performance brought by November 2021 firmwares. [JANUARY 2022] : November 2021 firmwares are available for download below. These two firmwares were correcting the muffled ATMOS. Complete history is described below. Check it out. [DECEMBER 2021 UPDATE] : mid December 2021, LG deployed an OTA firmware update (Main 2112010 / Micom 2110221 / Chrome Cast 1.52.246654). Muffled ATMOS is back again. What a pity... It was initially fixed by the NOVEMBER 2021 UPDATEfirmware. [NOVEMBER 2021 UPDATE: mid November 2021, LG deployed an OTA firmware update (Main 2111090 / Micom 2110221 / Chrome Cast 1.52.246654). [NOVEMBER 2021 UPDATE: beginning November 2021, LG deployed an OTA firmware update (Main 2110203 / Micom 2109301 / Chrome Cast 1.52.246654). Testing is necessary in order to status on the improvements. ATMOS has been vastly improved (ATMOS is fixed now). [JUNE 2021 UPDATE] : end June 2021, LG deployed an OTA firmware update (Main 2106150 / Micom 2104291 / Chrome Cast 1.52.246654). Testing is necessary in order to status on the improvements (if any). [PROVIDED BY LG FRANCE / OCTOBER 2021] Link to June 2021 firmware : [MAY 2021 UPDATE] : on May 2021, LG released a new firmware update (Main 2104290 /...