Switching from SPI Quad IO to standard SPI memory chip—data download issues?

HI
I am not an engineer, but I would like to ask the following
I have a medical device that always used an SPI Quad IO with a thermal pad which worked fine. We recently changed to a regular SPI memory chip with no thermal pad because of part obsolescence. We did not modify the firmware, CSI not MISO or MOSO. The problem we have is that the memory chip record data, but we are not able to download the data. As per the design, the memory chip can't be removed because is covered by over-molding. We access the memory via a USB tool

is there anything I need to consider downloading the data?

Hi.
We need to know the type of the memory.
Data could be encrypted too.
Giovanni

Ps.
Take a look at:
https://www.eeweb.com/spi-interface-non-volatile-memory/

or

https://www.eeweb.com/fpga-configuration-from-spi-flash-memory-using-a-microprocessor/

Regards

Hi,
I think you should submit a sketch with the connections between master and slave device, prior and after the memory chip replacement.
I'm not sure the same firmware can still run, maybe Quad SPI mode shall be disabled.

I guess you can consider the memory type and data.