boot priority - has precedence changed?

[jovval]

How to install and boot ROCK64 from eMMC? - https://forum.pine64.org/showthread.php?tid=4713
    shows
boot priority:
eMMC--> SPI flash-->  SD card

But, with both eMMC and microSD installed, I am seeing my Rock64 boot to microSD. How can this be?

1. Has the priority of the devices changed generally for the Rock64, or is it just my unit?
2. Does one of the devices boot directly, i.e. not use/require the SPI flash?
3. I found the following.
    Flashing and Erasing the SPI - https://github.com/ayufan-rock64/linux-b...ash-spi.md
Traditionally, booting Linux on the ROCK64 required an eMMC or microSD card, however it is now possible to boot without those, assuming the SPI memory has been flashed. The ROCK64 contains an onboard 128Mbit SPI flash memory, which can be flashed with U-Boot in order to provide additional boot options:
    USB2 / USB3 drive
    PXE
    microSD
    eMMC
Boot order:

1. SPI flash
   
2. eMMC (disable with jumper)
   
3. microSD
   
4. USB drive
   
5. PXE
   

This suggests that SPI must come first.
Can anyone comfirm the functioning of this u-boot?
Could someone point me to a pertinent thread for this u-boot?

4. How may I restore the original SPI flash?