2020 5.3L Tune ?

[AB77]

Is there any cheap mod or any way to unlock the ECM with low cost ? 

[Steve-2019]

Nope

[f8l vnm]

Like above poster said no not cheap. And why take a chance of getting your warranty voided on a giant brick ? ( I guess unless you have Heads/Cam or even Blower) just not worth in IMO. 

If you want quicker spend it on gears 

[Descartian]

HP Tuners is the only company that has been able to unlock the ECM and they price their service accordingly. Give it a year and more people will figure it out and the price will drop dramatically.