Quick impressions to KZ Castor:

• It sounds so good to me, this fits my entire shit ever compared to the old earphones I get. The bass is so deep (yes, i got the improved bass version), the treble is sparkly nice, the vocals are wide-open, and the instruments are clear. But yeah, I still need a DAC to check this bitch out.

Xiaomi smartphones offer the Worst Charging Solution

You may have seen Xiaomi smartphones failing to boot/charge after battery goes to 0%
Even the flagship Mi 13 Ultra with its 90W charger or mid-rangers like the Poco F5 does NOT charge at all but charges through PC/Laptop or using a 5W charger

Internally this problem is known as "PD Handshake not completing" (Although it did NOT even go to the handshake point) & occurs only when using a Xiaomi stock charger (30W+) & cable

Xiaomi cables are NOT PD certified but instead are PD compliant and they even implement DRM on their cable 💀 which is being managed via a binary called "batterysecret"

Here's what basically happens:
The phone tries to boot as a "charger" boot target, but since the voltage is too low, it's in blackout mode

Since there's literally NO pumping going on, it simply runs in normal USB power supply mode, which is basically the same as it is connected to a laptop and waiting for it to even get 1%

Since the phone does NOT reach userspace, there's absolutely NO way for it to start authentication at all ({ANDROIDBOOT_ROOT}/vendor/bin/batterysecret), it's not even a bootloader-level problem, it's handled in "android" itself

Another issue is that the Xiaomi charger is "extremely" slow to respond, causing USB collapse to happen that is disabled in the kernel but NOT in UEFI
Thus it causes constant USB disconnect & the phone NEVER charges

Xiaomi-PD is literally renamed PPS because Xiaomi could NOT afford to pay for certification & it is NOT USB PD certified either

While this problem is "kinda" fixed in the Xiaomi 14 series, older devices will NOT get a QoL update for this issue

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