How to get Framework v3 core working?

Hello there,

I have a lot of users from Android devices < 5 and would like to know how it’s possible to migrate from the latest framework7 version (5.X) back to framework7 v3?

My package.json

{
“name”: “”,
“private”: true,
“version”: “1.0.0”,
“description”: “”,
“repository”: “”,
“license”: “UNLICENSED”,
“scripts”: {
“start”: “npm run dev”,
“dev”: “cross-env NODE_ENV=development webpack-dev-server --config ./build/webpack.config.js”,
“build-dev”: “cross-env NODE_ENV=development node ./build/build.js”,
“build-prod”: “cross-env NODE_ENV=production node ./build/build.js”,
“postinstall”: “cpy ./node_modules/framework7-icons/fonts/. ./src/fonts/”
},
“dependencies”: {
@babel/polyfill”: “^7.12.1”,
“babel-plugin-transform-runtime”: “^6.23.0”,
“babel-preset-env”: “^1.7.0”,
“babel-preset-es2015”: “^6.24.1”,
“dom7”: “^2.1.5”,
“framework7”: “^3.5.0”,
“framework7-icons”: “^3.0.1”,
“jquery”: “^3.5.1”,
“swiper”: “^6.3.5”,
“template7”: “^1.4.2”
},
“devDependencies”: {
@babel/core”: “^7.12.10”,
@babel/plugin-proposal-class-properties”: “^7.12.1”,
@babel/plugin-proposal-object-rest-spread”: “^7.12.1”,
@babel/plugin-syntax-dynamic-import”: “^7.8.3”,
@babel/plugin-transform-runtime”: “^7.12.10”,
@babel/preset-env”: “^7.12.11”,
@babel/runtime”: “^7.12.5”,
“babel-loader”: “^8.2.2”,
“babel-plugin-transform-decorators-legacy”: “^1.3.5”,
“chalk”: “^4.1.0”,
“copy-webpack-plugin”: “^6.4.0”,
“cpy-cli”: “^3.1.1”,
“cross-env”: “^7.0.3”,
“css-loader”: “^5.0.1”,
“file-loader”: “^6.2.0”,
“framework7-component-loader”: “^2.1.2”,
“html-webpack-plugin”: “^4.5.0”,
“mini-css-extract-plugin”: “^1.3.2”,
“optimize-css-assets-webpack-plugin”: “^5.0.4”,
“ora”: “^5.1.0”,
“postcss-loader”: “^4.1.0”,
“postcss-preset-env”: “^6.7.0”,
“rimraf”: “^3.0.2”,
“style-loader”: “^2.0.0”,
“terser-webpack-plugin”: “^4.2.3”,
“url-loader”: “^4.1.1”,
“webpack”: “^4.44.2”,
“webpack-cli”: “^3.3.12”,
“webpack-dev-server”: “^3.11.0”
}
}

After I run
npm start

It will basically compile, but the page is blank and

has no content.

What could be the cause for that?