If your device has firmware version V4.x.x , you cannot "upgrade" to V1.5.1 ; these versions are tied to specific hardware revisions (e.g., different flash chips like Gigadevice vs. Macronix).
If the screen appears inverted after an update, you likely installed a firmware version meant for a different hardware revision. You will need to flash the correct original version to fix this. owon hds2102s firmware update link
Connect your HDS2102S to your PC using the provided USB-C cable. Power on the oscilloscope. If your device has firmware version V4
OWON firmware is across all HDS2102S units. you cannot "upgrade" to V1.5.1
