Oracle Secure Backup + Amazon S3 / RMAN-06172: no AUTOBACKUP found or specified handle is not a valid copy or piece I have backup in Amazon S3 that was created without AUTOBACKUP settings.
trying to recover parameter file:
RUN
{
  SET DBID 3427966416;
  ALLOCATE CHANNEL ch1 DEVICE TYPE sbt parms 'SBT_LIBRARY=/home/oracle/S3BCKP/lib/libosbws.so ENV=(OSB_WS_PFILE=/home/oracle/S3BCKP/config/s3backup.cfg)';
  RESTORE SPFILE TO PFILE '/home/oracle/initSUPERPROD.ora' FROM AUTOBACKUP MAXDAYS 12;
  SHUTDOWN ABORT;
}

then I get:
channel ch1: no AUTOBACKUP in 7 days found
released channel: ch1
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of restore command at 04/20/2021 09:21:38
RMAN-06172: no AUTOBACKUP found or specified handle is not a valid copy or piece

Backups are in the bucket. How to restore any of them?
upd. downloaded 0000000001 chunk that is relates to controlfile and spfile backuppiece with awscli utility
restore controlfile from '/home/oracle/0000000001';

channel ORA_DISK_1: restoring control file
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of restore command at 04/20/2021 10:28:40
ORA-19870: error while restoring backup piece /home/oracle/0000000001
ORA-19505: failed to identify file &quot;/home/oracle/0000000001&quot;
ORA-27048: skgfifi: file header information is invalid
Did not setup bucket name that was originally used duting backup creation:
echo &quot;OSB_WS_BUCKET=mycompany-oracle-database-bucket&quot; &gt;&gt; /home/oracle/S3BCKP/config/s3backup.cfg