In your description it is not clear were you are working... for example...
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To get recovery environment to boot, put rupor-rescue on the SD card partition 4 and then use this Python script to temporarily point uboot to load the rescue partition from SD card:
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How this? rupor-rescue is already on your custom SD image?
If I try this to mount the SD card partition 4 on my MacOS, I receive
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mount: /dev/disk2s4: unknown special file or file system.
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So, I can use rupor-rescue only into a separate SDCard.
Also..
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In the recovery shell you can run this to copy the uboot configuration from SD card to eMMC:
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but this command may be usefull if I have serial access to PRS-T1 with premade SDCard inserted... and I don't know how to.
Please, let me know some suggests.