Deep households pay social security in one lump sum.

1. It's not that Shenzhen hukou cannot pay social security in one lump sum.

2. Social security can be moved from other places to Shenzhen, and the accumulated social security can be retired in Shenzhen in 15 years.

You can pay social security elsewhere and move to Shenzhen.

4. You can also move your child's household registration to Shenzhen, and then move your household registration to Shenzhen. You can pay social security in Shenzhen.

Further reading: How to buy insurance, which is good, and teach you how to avoid these "pits" of insurance.