This is a list of exploits or tools that can help you jail break your device so you can install Debian:
backdoor for Allwinner-based devices running the vendor's Linux 3.4 kernel
SamsungCID: Samsung eMMC exploit allowing bootloader unlock
routersploit: Router Exploitation Framework
WarOfTheWorlds: shellcode to hack Linux from a vulnerable TrustZone QSEE
Microsoft Secure Boot debug-mode: allows breaking Secure Boot on Windows RT devices
Quadrooter: four local-root vulnerabilities in Qualcomm-based Android devices
dirtyc0w: root exploit for Linux bug that was open for 10 years (Android rooting tool)
Drammer: tool for exploiting Android phones via Rowhammer issues in RAM modules
optus-sagemcom-fast-3864-hacks: enable telnet and run arbitrary code on the Optus Sagemcom F@ST 3864 broadband modem
BitUnmap: vulnerability in Android ashmem
DCCP vuln: ancient Linux DCCP local root exploit
PegaSwitch: exploit toolkit for the Nintendo Switch
Samba remote code execution: useful for NAS/router systems running samba, use metasploit to get in