Posting this to see if I might be able to get some help. I have intermediate knowledge of Android OS, so I'm looking for step by step help. I currently have no PC access which makes all of this much harder. Device I'm currently on is ZTE Zmax Pro, (no root on marshmallow 6.0.1)which probably won't be of any help in this situation. I've researched several threads in the XDA forums but haven't really found a step-by-step that doesn't require PC.

Here's all my device information for the Lenovo Tablet

Model: TB-8504F

Build Number: TB-8504F_S000053_180205_ROW

Build Version: NMF26F

(not sure if needed but providing anyways)

Local Storage is 16gB

I added 32gB microSd

API lvl: 25

CPU: arm64-v8a

os.arch: aarch64

Kernel: Linux Version 3.18.31-perf-gfedb9ec-dirty
ANDROID_ASSETS=/system/app

-Environment Variables (12)-

ANDROID_BOOTLOGO=1

ANDROID_DATA=/data

ANDROID_ROOT=/system

ANDROID_SOCKET_zygote=8

ANDROID_STORAGE=/storage

ASEC_MOUNTPOINT=/mnt/asec

BOOTCLASSPATH=/system/framework/core-oj.jar:/system/framework/core-libart.jar:/system/framework/conscrypt.jar:/system/framework/okhttp.jar:/system/framework/core-junit.jar:/system/framework/bouncycastle.jar:/system/framework/ext.jar:/system/framework/framework.jar:/system/framework/telephony-common.jar:/system/framework/voip-common.jar:/system/framework/ims-common.jar:/system/framework/apache-xml.jar:/system/framework/org.apache.http.legacy.boot.jar:/system/framework/dolby_ds2.jar:/system/framework/dolby_ds1.jar:/system/framework/tcmiface.jar:/system/framework/WfdCommon.jar:/system/framework/oem-services.jar:/system/framework/qcom.fmradio.jar:/system/framework/qcmediaplayer.jar:/system/framework/telephony-ext.jar

DOWNLOAD_CACHE=/data/cache

EXTERNAL_STORAGE=/sdcard

PATH=/sbin:/vendor/bin:/system/sbin:/system/bin:/system/xbin

SYSTEMSERVERCLASSPATH=/system/framework/services.jar:/system/framework/ethernet-service.jar:/system/framework/wifi-service.jar
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I appreciate any support or feedback. Thank you!