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external ssd Apple 251 GB, apfs formatted

My external ssd doesn't show up on the desktop. It is visible in disk utility but it has become unwritable. I can't repair, split or erase the disk' Does anyone have an advise for this issue?
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by Lance-scs.
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thunderbolt bridge to ethernet connection

I am running a MBP intel with macOS 11.6.2 platform and 2 Thunderbolt ports. I travel much and sometimes Wifi is not available and I have to use the ethernet cable. Before upgrading to Big Sur it was automatically connecting and working well. But now the thunderbolt bridge does not connect although when I look into About this Mac, System Report, it says connected. When I switch the cable to the other port, it also reports 'connected' to the other port in the System Report. But, I have no internet connection because in the System Preferences-Network panel it reports: Thunderbolt Bridge not connected. How should I configure this? Could any one help me out?
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by Lance-scs.
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no permission

You do not have permission to open the document “256x256_OSX.png”. after the update to Big Sur I am unable to open some files. I have tried to reset permissions in Finder/Get Info but to no avail
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by Lance-scs.
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Apple Diagnostics with Big Sur version 11.1

Running Big Sur 11.1 cannot go into the Recovery Mode. Anyone tried it? It stops at the very beginning with a warning sign and error 5101D
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by Lance-scs.
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download Big Sur

I have downloaded the installer. It is installed in the applications folder. When I click, it says "the requested version of Mas OS is not available" What did I miss?
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by Lance-scs.
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