I was successful in using the smartlife web firmware upgrade to a tasmota-lite.bin V8.5.1. Then upgrade tasmota with latest tasmota.bin.gz. The file size matters and the lite version is 474kb. There was no indication that the flash was over but after a while I saw the tasmota hotspot. You can configure module as H801, I used Arilux LC01 for rgb light strip. Works fine but I miss the cool animations.
Note the file extentions on the firmware file. Tasmota 8.5.1 gave tasmota the capability to used gzipped bin files hence the .bin.gz filename for final upgrade. The smartlife web interface does not support the smaller gzipped files so must use a small tasmota bin file.
Edit: It might have been the latest v12.1.1 tasmota-lite.bin it’s file is 513kb That I installed directly from the web interface.