Samsung devices are notoriously hard to crack. GSMOneInfo provides a free client for this.
GSMOneInfo supports generic MTK (MediaTek) and Qualcomm chipsets, which power hundreds of models. Specifically, it works well with: gsmoneinfo androidfrp free
Disclaimer: This guide is for educational purposes and for unlocking devices you legally own. Unauthorized access to lost or stolen property is illegal. Samsung devices are notoriously hard to crack