Upon rebooting, the phone bypasses the setup wizard. You either:

Using QSF protocols trips Knox eFuse on Samsung devices. Knox Warranty Bit becomes 0x1. Samsung Pay and Secure Folder will never work again.

Unlike older methods requiring you to short test points (EDL), the "Hot" method uses a software trigger:

QSFR is a mechanism provided by Qualcomm for their chipsets, which allows for the recovery and updating of firmware. This is particularly useful in scenarios where the device's firmware is corrupted or compromised, potentially rendering the device unusable.

Most modern Samsung Galaxy A, M, F, and even some S-series devices (especially US/China variants) run on Qualcomm Snapdragon processors. Qualcomm chips use a specific boot and communication protocol, often involving Download Mode and EDL (Emergency Download Mode) .

Samsung, however, has its own proprietary interface called QSF (Qualcomm Samsung Firehose) – a low-level programmer that communicates with the eMMC/UFS storage chip on Samsung devices with Qualcomm SoCs.

QSF acts as the "loader" that lets you send commands directly to the device’s storage, bypassing the high-level Android OS. This is where FRP removal becomes possible.