I did this by exploit I found in qualcom filesys, it works on all qc chip, but it is not cheap, this exploit can also be used as main exploit for jailbreak, works on all platforms for ios as well as android, it makes efs clear able and makes nvm write able. cost is more than 150k if you want it I will sell it to you but it does not come with weeks of training, you must posses the knowledge of how to use it for yourself if you buy it.
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