How to restore postgres 12 generated sql file into postgres 9.6 database

I am trying to restore the database. The database sql file is about 4.5 GB so I couldn’t edit it on editor. I dump the database using following command in postgres 12;

pg_dump -d postgres > backup.sql

But I need the same database in postgres 9.6. For this purpose, I write the following code to restore it

psql -d postgres < backup.sql

It shows the error like this (Error in creating sequence). But this is not the duplicated one with given question. error message;

SET
ERROR:  unrecognized configuration parameter "default_table_access_method"
CREATE TABLE
ALTER TABLE
ERROR:  syntax error at or near "AS"
LINE 2:     AS integer
            ^
ERROR:  relation "epicenter.epicenter_gid_seq" does not exist
ERROR:  relation "epicenter.epicenter_gid_seq" does not exist
CREATE TABLE
ALTER TABLE
ERROR:  syntax error at or near "AS"
LINE 2:     AS integer
            ^
ERROR:  relation "public.725_4.5_tur_gid_seq" does not exist
ERROR:  relation "public.725_4.5_tur_gid_seq" does not exist
CREATE TABLE
ALTER TABLE

I saw the answer of this question. The answer already said the sql file will not work on older version. But I want to know, Is there any way to restore using this sql file?

Answer

Thank you @jjanes and @JGH for your kind cooperation. I found the one solution. First I backup the database using following command;

pg_dump -U postgres -h localhost -p 5432 -W earthquake | gzip -c > backup.gz

Then I create earthquake database manually from the pgadmin 4. After getting the backup.gz file, I restore it using following command in terminal;

gzip -d -c backup.gz | sed -e '/AS integer/d' | psql -U postgres -h localhost -p 5432 -W earthquake