Why Deco M4R v2 can't install Beta Firmware 1.7.0?

Hi, Tplink!
Hi it's me again, I once installed beta firmware 1.7.0 to my m4r v2 and it didn't work. It said that the firmware was incorrect, I tried installing it both from webUI and firmware recovery mode. Both failed. But I see from this forum there are some who have the same hardware as me M4R V2, they managed to install beta firmware 1.7.0 why can't mine?
Note i have 4 deco, E4 v1 3 pcs, M4 v2 (1.6.5 firmware) 1 pcs. Since the E4 had the new 1.7.0 update and can do connection preference, thats why i want my m4 can do the same..
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@ARGamingPK1 Hmm I think you don't understand, my 5ghz wifi seems to be damaged because of the chip.. it has nothing to do with the firmware.. So from all the decos I have, only the M4 can't transmit 5ghz signals, only 2.4ghz. But the E4, both signals work fine...but thanks any way for the suggestion...
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@ryg What's your 5 GHz wifi channel on Deco E4 ?? Can you please check on WiFi Analyzer App on phone. I think your Deco E4 units are supported channels 149 to 161 but your Deco M4 is'nt supported but the Bangladesh firmware will allow you to get 5 GHz channels 149 to 161
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@ARGamingPK1 yes 149 - 160 where can i get that bangladesh firmware?
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@ryg You can download the Bangladesh firmware from the link below and then Unzip the Zip file and install it by Recovery Mode in Deco M4 by using your PC or Laptop. After the firmware successfully installed so then u can update the Deco M4 from Deco App on 1.6.5 firmware.
https://static.tp-link.com/beta/2021/202103/20210325/M4_1.4.3_V2_add_B4_code.zip
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@ARGamingPK1 No not working!! video read the notepad on the video.....
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@ryg Yeah i saw your video. I think u have to wait for official 1.7.0 firmware.
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@ARGamingPK1 yeah i guess....
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@ryg Hey u can try this Pre-Release Firmware on Deco M4 from the link below. 🤗
https://community.tp-link.com/en/home/forum/topic/793908?replyId=1526266
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wow all ready??? Yipiiii...ok i try now...thanks for the info broo
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@ryg So are u happy now 🤗
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