Internet Recovery fails. USB Boot fails. Target mode won't mount.
Macbook Air 2019 TrueTone, ran before I deleted the SSD (stupid). Battery shot, requires power supply to run.
Tried Internet Recovery with CMD-R, OPT-CMD-R, SHFT-OPT-CMD-R. All run download with progress (about an hour), then remain at full progress bar for days until I shut down. Reset PRAM. Tried various Internet, including Gigabit speed. 20 tries or more, occasional dropped Internet error -2003F on lousy WiFi.
USB boot defaults to Internet Recovery. USB Drive is recognized, chosen, goes directly to Internet Recovery. Created several USB boots with several sticks and several apps, including manual w/ Terminal. Chose various erase formats (GUID, etc). Chose several OS installers (Catalina, Mojave). Latest USB stick with Mojave boots older 2014 iMac, but not the new Macbook.
Will not mount in Target mode. Macbook displays target mode, but will not mount on iMac. Bought a new wire.
Beautiful, new, clean laptop, hardly used, left discharged for months, thus bad battery.
Can anyone think of anything else to try? Apple Store, maybe? Would they do anything I haven't? Does a dead battery affect these things?