TP Link EAP615 Wall V1 factory.bin can't be loaded with recent OEM firmware

I have a TP Link EAP615 Wall V1 sold in Australia. The label says US/1.0 but evidently the preloaded OEM firmware knows it is AU and refuses to load the OpenWRT factory.bin. I tried downgrading to an earlier OEM firmware as interim step, but EAP615-WALLv1_1.5.3 is the earliest version with AU support. After spending some time with TP-Link support they confirmed this.

Also, the way format of the TP-Link support list has changed somewhere between EAP615-WALLv1_1.2.3 and EAP615-WALLv1_1.5.0.

From tplink-safeloader -i <OEM >.bin.

1.2.3

SupportList:
EAP615-Wall(TP-Link|UN|AX1800-D):1.0
EAP615-Wall(TP-Link|CA|AX1800-D):1.0
EAP615-Wall(TP-Link|JP|AX1800-D):1.0
EAP615-Wall(TP-Link|EG|AX1800-D):1.0

1.5.3

SupportList:
EAP610(TP-Link|UN|AX1800-D):3.0 RU,EG,CA,JP,KR,AU
EAP613(TP-Link|UN|AX1800-D):1.0 JP,CA,KR,AU
EAP615-Wall(TP-Link|UN|AX1800-D):1.0 RU,EG,CA,JP,KR,AU
EAP615-WE(TP-Link|UN|AX1800-D):1.0 JP

This tplink-safeloader-support.patch worked for me, but I don't know it it breaks installation on devices with earlier OEM firmware. Maybe both styles of support list can co-exist, but I didn't try that and I notice TP-Link don't do that.

Start by running tplink-safeloader -i on the cited EAP615-WALLv1_1.2.3 and 1.5.3 OEM images, then inspect the attached tplink-safeloader-support.patch. Compare how both SupportList formats are handled and verify that the resulting factory.bin loads for AU firmware without breaking devices using the earlier format.